Po4 compound name

3. Compute Mass of Each Element. Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in Sb3 (PO4)5: Molar Mass (g/mol) Sb (Antimony) 3 × 121.76 = 365.28. P (Phosphorus) 5 × 30.973762 = 154.86881. O (Oxygen)

Po4 compound name. Best Answer. The name of the compound (NH4)3PO4 is triammonium phosphate. Wiki User. ∙ 8y ago. More answers. Wiki User. ∙ 10y ago. Ammonium Phosphate. Wiki User.

The first thing we need to do is figure out what kind of compound we are working with, as ionic and covalent compounds have very different naming systems. Ionic compounds are made up of a metal cation (named first) and a non-metal anion (named second). If the first element you "see" in the compound is found on the left side of the periodic ...

Two-year toxicology and carcinogenesis studies of chlorinated trisodium phosphate, an inclusion complex of trisodium phosphate and sodium hypochlorite used in various cleaning compounds, were conducted by administering 0,500, or 1,000 mg/kg (dose volume: 10 mL/kg) of the chemical in water by gavage, 5 days per week for 103 weeks, to groups of ... Modify: 2024-04-27. Description. Tripotassium phosphate is an inorganic potassium salt that is the tripotassium salt of phosphoric acid. It is an inorganic phosphate salt and an inorganic potassium salt. ChEBI.Ask a tutor. If you have any additional questions, you can ask one of our experts.If you’ve ever wondered how long you need to wait before painting after repairing a wall, DAP DryDex Spackling Compound is for you. Expert Advice On Improving Your Home Videos Late...Common compound names. Examples of molar mass computations: NaCl , Ca(OH)2 , K4[Fe(CN)6] , CuSO4*5H2O , nitric acid , potassium permanganate , ethanol , fructose , caffeine , water . Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions …Molar Mass: 380.5807. Cu3 (PO4)2 Molar Mass Converter. Weight: Mole: Cu3 (PO4)2 is a green powder at room temperature. It is insoluable in water. Cu3 (PO4)2 may cause burns to eye and skin. It may cause digestive tract irratation if swallowed.Tricalcium phosphate (sometimes abbreviated TCP ), more commonly known as Calcium phosphate, is a calcium salt of phosphoric acid with the chemical formula Ca 3 (PO 4) 2. …

The correct name for mn3(po4)2 is manganese(ii) phosphate. ... Dimensional Analysis 1. I have 470 milligrams of table salt, which is the chemical compound NaCl. How many liters of NaCl solution can I make if I want the solution to be 0.90% NaCl? (9 grams of salt per 1000 grams of solution). The density of the NaCl solution is 1.0 g solution/mL ...Zinc phosphate | Zn3(PO4)2 or O8P2Zn3 | CID 24519 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. ... L49, L74) Zinc phosphate (Zn3(PO4)2) is an inorganic chemical compound used as a corrosion resistant ...Ammonium phosphate is an unstable compound made of ammonium and phosphate salt with the chemical formula (NH 4) 3 PO 4. Ammonium phosphate is manufactured by mixing together ammonium phosphate and urea in a molten condition. Considerable heat is generated which transform the ammonium phosphate to the molten state.In this video we'll write the correct name for K3PO4. To write the name for K3PO4 we’ll use the Periodic Table and follow some simple rules.Because K3PO4 has...Antimonic Phosphate. Formula: Sb3 (PO4)5. Molar Mass: 840.1368. Sb3 (PO4)5 Molar Mass Converter. Weight: Mole: Sb3 (PO4)5 Molar Mass Conversion in Batch.

Tungsten(VI) Phosphate W(PO4)2 Molecular Weight, molar mass converterPolyatomic ions. Polyatomic ions are molecular ions composed of two or more atoms bonded by covalent bonds and acting as a single unit, but unlike molecules, they have a net charge on them. The examples include cations like ammonium ion ( NH+4 NH 4 + ), and hydronium ion ( H3O+ H 3 O + ); and anions like hydroxide ion ( OH− OH − ), and ...phosphoric acid, (H 3 PO 4 ), the most important oxygen acid of phosphorus, used to make phosphate salts for fertilizers. It is also used in dental cements, in the preparation of albumin derivatives, and in the sugar and textile industries. It serves as an acidic, fruitlike flavouring in food products. Pure phosphoric acid is a crystalline ...Trisodium phosphate (TSP) is an inorganic compound with the chemical formula Na 3 P O 4. It is a white, granular or crystalline solid, highly soluble in water, producing an alkaline solution. TSP is used as a cleaning agent, builder, lubricant, food additive, stain remover, and degreaser. [7]In production, hydroxyapitite, Ca5 (PO4)3OH. is formed by the complete neutralization of phosphoric acid with slaked lime and subsequent filtration, drying, and grinding. The Ca/P ratio depends on the process conditions. Pure Ca3 (PO4)2, can be obtained from hydroxyapitite by calcination above 900 °C.

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In this video we'll write the correct name for Sn3(PO4)4. To write the name for Sn3(PO4)4 we’ll use the Periodic Table and follow some simple rules.Because S...Calcium phosphate is the usual constitution of microcalcifications of the breast, particularly dystrophic calcifications. Microcalcifications as can be seen on mammography can be an early sign of breast cancer. Based on morphology, it is possible to classify by radiography how likely microcalcifications are to indicate cancer. [6]Transition Metal Ionic Compound Name; FeCl 3: iron(III) chloride: Hg 2 O: mercury(I) oxide: HgO: mercury(II) oxide: Cu 3 (PO 4) 2: copper(II) phosphateIn this video we'll write the correct name for Na3PO4.To write the name for Na3PO4 we’ll use the Periodic Table and follow some simple rules. Because Na3PO4 ...

phosphoric acid, (H 3 PO 4 ), the most important oxygen acid of phosphorus, used to make phosphate salts for fertilizers. It is also used in dental cements, in the preparation of albumin derivatives, and in the sugar and textile industries. It serves as an acidic, fruitlike flavouring in food products. Pure phosphoric acid is a crystalline ...Explanation: K is potassium. H is hydrogen, and as there are two of them it becomes dihydrogen (di means 2). P O4 is phosphate. Hence, potassium dihydrogen phosphate. Answer link. Potassium dihydrogen phosphate K is potassium H is hydrogen, and as there are two of them it becomes dihydrogen (di means 2). PO_4 is phosphate Hence, potassium ...Aluminum carbonate. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.15 Jun 2017 ... 4:03 · Go to channel · ALEKS: Deducing the empirical formula of a binary ionic compound from its name. Roxi Hulet•2K views · 16:04 · Go ...Better yet, purchase products labeled low or no VOC to reduce the level of volatile organic compounds in your home. Expert Advice On Improving Your Home Videos Latest View All Guid...There are 4 easy steps to find the molar mass of Zn3 (PO4)2*4H2O based on its chemical formula. 1. Count The Number of Each Atom. The first step to finding the molar mass of Hopeite is to count the number of each atom present in a single molecule using the chemical formula, Zn3 (PO4)2*4H2O: 2. Find Atomic Mass of Each Element.This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer. Question: 8. Write the name of Co3 (PO4)2 compound. Show transcribed image text. Here's the best way to solve it.Stannic Phosphate. Formula: Sn3 (PO4)4. Molar Mass: 736.0154. Sn3 (PO4)4 Molar Mass Converter. Weight: Mole: Sn3 (PO4)4 Molar Mass Conversion in Batch.In this video we'll write the correct name for Na3PO4.To write the name for Na3PO4 we'll use the Periodic Table and follow some simple rules. Because Na3PO4 ...

Best Answer. Co2 is the chemical name for carbon dioxide which is soluble in water, while Po43 is the chemical name for Phosphate, Wiki User. ∙ 9y ago.

To name main group anions, we add the suffix -ide to the end of the element's name. Cations and anions combine to form ionic compounds. Ionic compounds are named with the cation first and the anion last. The same convention is used when writing their chemical formulas. Ionic compounds must be electrically neutral.Crystal structure. Chromium (III) phosphate can exist as two isomorphs. Its β-isoform is orthorhombic with the Cmcm space group (a = 0.5165, b = 0.7750, c = 0.6131 nm). The structure consists of infinite chains of trans edge-sharing CrO6 octahedra, which run parallel to the c-axis, and are linked by PO4 tetrahedra. A calculator that can convert between chemical formulas, whether elements or compounds, and their respective names. Get the free "Chemical Nomenclature" widget for your website, blog, Wordpress, Blogger, or iGoogle. Find more Chemistry widgets in Wolfram|Alpha. 1. Phosphates Are Everywhere. Phosphorus shows up in nature as phosphate (PO4 3- ), and there's very little phosphates can't do, from cleaning your house to storing energy in your cells. Phosphates can be found in your toothpaste, your bones, table salt, fire extinguishers, your DNA, yoga mats, snack cakes — you name something, it probably ...Expert-verified. The compound Co3 (PO4)2 is an ionic compound. What are the ions of which it is composed? Cation formula Anion formula.Best Answer. Fe3+ combines with PO43- ion to form FePO4. FePO4 is called ferric phosphate or iron (III) phosphate. Wiki User. ∙ 11y ago.Manganese(IV) Phosphate Mn3(PO4)4 Molecular Weight, molar mass converterCobalt(II) Phosphate Co3(PO4)2 Molecular Weight, molar mass converterThe name of the acid is based on the anion attached to the hydrogen. 5.9: Naming Acids is shared under a CK-12 license and was authored, remixed, and/or curated by Marisa Alviar-Agnew & Henry Agnew. An acid can be defined in several ways. The most straightforward definition is: an acid is a molecular compound that contains one or more hydrogen ...Chemistry questions and answers. This question has multiple parts. Work all the parts to get the most points. a Name the following ionic compound: Fe3 (PO4)2 b Name the following ionic compound: KHSO4 Submit c Name the following ionic compound: Ca (CIO4)2 d Name the following ionic compound: (NH4)2SO4 Not submitted e Name the following ionic ...

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Phosphate is a very weak oxidizing agent. Since the phosphorus is in its highest oxidation state in phosphate ion, this ion cannot act as a reducing agent. This page titled Phosphate Ion (PO₄³⁻) is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by James P. Birk. Phosphate ion is a reasonably strong base.CrIII compounds do not cause chrome ulcerations but may cause allergic dermatitis in workers with prior sensitization to CrVI compounds. [ILO Encyclo] CrIII is an essential trace mineral in the human diet. [ATSDR Case Studies] Toxic by ingestion; May be harmful if absorbed through skin or inhaled. Stable under recommended storage conditions.Compose the chemical formula for the ionic compound formed between the given pair of ions. Name the compound. Al3+ and CO3 2-Write the formula for the ionic compound magnesium phosphate (containing the PO43- ion). What is the name of the compound with the formula Mg3(PO4)2? A calculator that can convert between chemical formulas, whether elements or compounds, and their respective names. Get the free "Chemical Nomenclature" widget for your website, blog, Wordpress, Blogger, or iGoogle. Find more Chemistry widgets in Wolfram|Alpha. Zinc phosphate is an inorganic compound with the formula Zn 3 (PO 4) 2.This white powder is widely used as a corrosion resistant coating on metal surfaces either as part of an electroplating process or applied as a primer pigment (see also red lead).It has largely displaced toxic materials based on lead or chromium, and by 2006 it had become the most commonly used corrosion inhibitor.ChEBI Name. iron (3+) phosphate. ChEBI ID. CHEBI:131371. Definition. An inorganic phosphate having Fe (3+) as the counterion. Stars. This entity has been manually annotated by the ChEBI Team. Supplier Information.Pb3 (PO4)2. The formula for the compound lead (II) phosphate is Pb3 (PO4)2.BRIAN M. Jun 18, 2014. The compound Ca3(P O4)2 is the molecule Calcium Phosphate. Calcium is a +2 cation Ca+2. Phosphate is a -3 polyatomic anion P O−3 4. It takes three +2 calcium ions to balance with two -3 phosphate ions in order for the ionic charges to be equal an opposite. I hope this was helpful.3.5: Ionic Compounds- Formulas and Names is shared under a license and was authored, remixed, and/or curated by LibreTexts. Chemists use nomenclature rules to clearly name compounds. Ionic and molecular compounds are named using somewhat-different methods. Binary ionic compounds typically consist of a metal and a nonmetal.….Science. Chemistry. Chemistry questions and answers. 21. Write the name for Ba3 (PO4)2 A) barium (III) phosphite B) barium (II) phosphite C) barium phosphate D) tribarium phosphorustetraoxide E) barium phosphite 22. Na2S is named A) sodium disulfide. B) sodium sulfide.The name of compound (NH4)PO4 is Ammonium Phosphate .NH4 and PO4 are both polyatomic ionsNH4(ammonium) has a positive 1 charge, and is the cationPO4(phosphate) has a negative three charge, and is ...Expert-verified. The compound Co3 (PO4)2 is an ionic compound. What are the ions of which it is composed? Cation formula Anion formula. ….

Potassium phosphate is a generic term for the salts of potassium and phosphate ions including: [1] Monopotassium phosphate (KH 2 PO 4) (Molar mass approx: 136 g/mol) Dipotassium phosphate (K 2 HPO 4) (Molar mass approx: 174 g/mol) Tripotassium phosphate (K 3 PO 4) (Molar mass approx: 212.27 g/mol) As food additives, potassium …In this video we'll write the correct formula for Phosphate ion (PO4 3-). To write the formula for Phosphate ion we must first recognize that it is a polyato...Modify: 2024-04-27. Description. Cadmium phosphate is a chemical compound of cadmium. Cadmium is a transition metal and chemical element with the symbol Cd and atomic number 48. It is found naturally in the earth's crust, though rarely on it's own. (L6) Toxin and Toxin Target Database (T3DB)Cobalt(II) Phosphate Tetrahydrate Co3(PO4)2.4H2O Molecular Weight, molar mass converterMagnesium phosphate anhydrous. View More... Molecular Weight. 262.86 g/mol. Computed by PubChem 2.2 (PubChem release 2021.10.14) Component Compounds. CID 1004 (Phosphoric Acid) CID 5462224 (Magnesium) Dates.What is the name of Ba3(PO4)2 ? (a) Identify what type of this compound is. Pick one from the following: i.e. Ionic compound (Type 1), Ionic compound (Type 2), Ternary lonic Compound, Covalent compound, Binary acid, or Ternary Oxyacid. (i.e. Sodium chloride −→ lonic compound (type 1)) (b) Show the charges of each ion.Write the name of the compound with the formula {eq}Pb_3(PO_4)_2 {/eq} and identify the cation and anion. Ionic Compounds: An ionic bond is sustained by an electrostatic attraction between the positive ion (called the cation) and the negative ion (called the anion).The formula of the compound is \(\ce{Mg3(PO4)2}\) Note in the above Example 9 that parentheses are placed around the polyatomic portion of compound, to indicate that it must be treated as a complete and whole unit. ... The name of this compound is tetraphosphorus trisulfide. The formula of this compound is \(\ce{P4S3}\) Example \(\PageIndex{14}\): Po4 compound name, 1 Answer. MeneerNask. Mar 6, 2016. Chromium (III)phosphate. Explanation: Since the oxidation states of P can be +3 or + 5, (and here it is obviously +5 ), and the oxidation state of O is −2 the total charge of the phosphate will be −3, or P O3− 4. It is called phosphate because of this higher state (otherwise it would be called phosphite ..., View this answer. The name of the compound FePO 4 is iron (III) phosphate. Fe is the symbol for the element iron. Iron has two common oxidation states, Fe (II) and Fe... See full answer below., Phosphorus (III) oxide dissolves slowly in cold water to form phosphorous acid, H 3 PO 3. Figure 18.8.2 18.8. 2: This image shows the molecular structures of P 4 O 6 (left) and P 4 O 10 (right). Phosphorus (V) oxide, P 4 O 10, is a white powder that is prepared by burning phosphorus in excess oxygen. Its enthalpy of formation is very high (− ..., Zinc phosphate is an inorganic compound with the formula Zn 3 (PO 4) 2.This white powder is widely used as a corrosion resistant coating on metal surfaces either as part of an electroplating process or applied as a primer pigment (see also red lead).It has largely displaced toxic materials based on lead or chromium, and by 2006 it had become the most commonly used corrosion inhibitor., Iron (III) phosphate, also ferric phosphate, [4] [5] is the inorganic compound with the formula Fe PO 4. Four polymorphs of anhydrous FePO 4 are known. Additionally two polymorphs of the dihydrate FePO 4 · (H 2 O) 2 are known. These materials have attracted much interest as potential cathode materials in batteries. , Compound Search; Iron(III) Phosphate. Name: Iron(III) Phosphate. Alias: Ferric Phosphate. Formula: FePO4. Molar Mass: 150.8164. FePO4 Molar Mass Converter. Weight: Mole: FePO4 is a yellow brown solid at room temperature. It is insoluable in water. Its melting point is 250 ̊C (482 ̊F), density 3.056 g/cm3. ..., FAQ. If you're proficient in using formulae to represent chemical compounds but are not so confident in translating them into scientific names, our chemical name calculator may be just right for you. Here you will find the names and formulas of ionic compounds without having to memorize the terminology (or, at least, all of it)., Zinc phosphate is an inorganic compound made up of phosphorous, oxygen and zinc with the formula Zn3 (PO4)2. Zinc phosphate is typically used for permanent cementation in dentistry. Zinc phosphate is a white powder which is commonly used as a corrosion inhibitor when applied to metallic surfaces. Trizinc phosphate coats better on a crystalline ..., In this video we'll write the correct name for Li3PO4. To write the name for Li3PO4 we'll use the Periodic Table and follow some simple rules.Because Li3PO4 ..., Iron (III) phosphate, also ferric phosphate, [4] [5] is the inorganic compound with the formula Fe PO 4. Four polymorphs of anhydrous FePO 4 are known. Additionally two polymorphs of the dihydrate FePO 4 · (H 2 O) 2 are known. These materials have attracted much interest as potential cathode materials in batteries., Vanadium(V) phosphate is an ionic compound made up of vanadium(V) cations and phosphate anions.. The (V) Roman numeral used to name the cation indicates that vanadium, a transition metal, is in its #+5# oxidation state, i.e. the vanadium cation carries a #5+# charge. #"V"^(5+) -># the vanadium(V) cation The phosphate anion is a polyatomic ion that consists of #1# phosphorus atom and #4# oxygen ..., Crystal structure. Chromium (III) phosphate can exist as two isomorphs. Its β-isoform is orthorhombic with the Cmcm space group (a = 0.5165, b = 0.7750, c = 0.6131 nm). The structure consists of infinite chains of trans edge-sharing CrO6 octahedra, which run parallel to the c-axis, and are linked by PO4 tetrahedra., Compute Mass of Each Element. Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in Mg3 (PO4)2: Molar Mass (g/mol) Mg (Magnesium) 3 × 24.305 = 72.915. P (Phosphorus) 2 × 30.973762 = 61.947524. O (Oxygen) 8 × 15.9994 = 127.9952., For Ca 3 (PO 4) 2 use the hints and resources below to help write the name. Okay - we know this is a ternary ionic compound because we have a metal (Ca) attached to a group of non-metals (PO 4 ). Write the name given on the Periodic Table for Ca. Look up the name for PO 4 on the Common Ion Table., The molar mass of (NH4)3PO4 is 149.087 grams per mole. Finding this answer involves using the number of atoms of each element in the molecular formula for this compound and their a..., Crystal structure. Chromium (III) phosphate can exist as two isomorphs. Its β-isoform is orthorhombic with the Cmcm space group (a = 0.5165, b = 0.7750, c = 0.6131 nm). The structure consists of infinite chains of trans edge-sharing CrO6 octahedra, which run parallel to the c-axis, and are linked by PO4 tetrahedra., Cd (NO3)2 4H2O. cadmium II nitrate tetrahydrate. MgCl2 7H2O. magnesium chloride heptahydrate. AlCl3 2H2O. aluminum chloride dihydrate. MnSO4 H2O. manganese II sulfate monohydrate. naming of hydrates -no subscripts used use a space instead of "dot" Learn with flashcards, games, and more — for free., Write the name of the compound with the formula Pb3(PO4)2 and identify the cation and anion. Write the name of the compound with the formula Co(CH3COO)2 and identify the cation and anion. (a) Name the compound: Mg(CN)_2. (b) Identify it as an ionic compound, acid, or molecular compound. Name the ionic compound for CaI_2. (a) Name the compound ..., Description. Phosphate (3-) is a phosphate ion that is the conjugate base of hydrogenphosphate. It is a phosphate ion and a trivalent inorganic anion. It is a conjugate base of a hydrogenphosphate. ChEBI. Phosphate is a metabolite found in or produced by Escherichia coli (strain K12, MG1655). E. coli Metabolome Database (ECMDB) phosphate is a ... , Jordan Gonen and Jacob Schein had both worked in the tech industry for a few years when they realized they lacked a clear understanding of their own finances. Like many other tech ..., Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. Since there is an equal number of each element in the reactants and products of Ag3PO4 = 3Ag + PO4, the equation is balanced., Part M The name of the compound Zn3 (PO4)2 is zinc phosphate. zinc (II) phosphide. zinc phosphide. zinc phosphorus oxide. Transcribed Image Text: Part M The name of the compound Zn3 (PO4)2 is zinc phosphate. zinc (II) phosphide. zinc phosphide. zinc phosphorus oxide. This is a popular solution!, Consider these compounds: A. Pb3 (PO4)2 B. Ba3 (PO4)2 C. PbCrO4 D. CaCO3 Complete the following statements by entering the letter (s) corresponding to the correct compound (s). (If more than one compound fits the description, include all the relevant compounds by writing your answer as a string of characters without punctuation, e.g, ABC.), The name of the formula Zn3 (PO4)2 would be simply zinc phosphate. It also carries a net charge of zero, as Zn3 has a charge of +6 and (PO4)2 has a charge of -6. The name of this compound is zinc ..., 5.3 Naming Compounds that contain Polyatomic Ions. Page ID. Table of contents. Key Takeaways. There also exists a group of ions that contain more than one …, lead (IV) nitride. Covalent, Pb3N2. Pentacarbon dodecahydride: ionic or covalent and write the chemical formula. Covalent, C5H10. V (SO4)2: ionic or covalent and write the compound name. Ionic, Vanadium (II) sulfate. Ag2CO3: ionic or covalent and write the compound name. Ionic, Silver carbonate., PO 4 3- is a chemical derivative of phosphoric acid with a chemical name Phosphate. Phosphate is also called Phosphate ion or Orthophosphate. It is a trivalent inorganic anion and a conjugate base of hydrogen phosphate., Figure2.7.3 2.7. 3: Example of some compounds that have multiple oxidation states. Note mercury (1) is not a monoatomic cation, but is really a homonuclear diatomic ion of two mercury atoms bound to each other, …, Molar mass of Ca10F2(PO4)6 is 1008.6050 g/mol. Get control of 2022! Track your food intake, exercise, sleep and meditation for free. Convert between Ca10F2(PO4)6 weight and moles. Compound., Sn3(PO4)2 ⇒ tin(II).phosphate. Answer link. Tin (II) phosphate. The trick here is to recognize the fact that you're dealing with a transition metal, which should let you know that the name of the compound will have to include Roman numerals. You should also recognize the fact that this compound contains the phosphate polyatomic ion, "PO"_4^ (3-)., Answer and Explanation: 1. In the given formula, we have cation as magnesium ion and the anion entity is phosphate molecule. The charge on magnesium is +2 while that on phosphate is 3-. According to the rules of writing chemical formula, a formal charge of magnesium will be assigned to phosphate and the charge present on phosphate will be ..., In this video we'll write the correct name for (NH4)3PO4. To write the name for (NH4)3PO4 we'll use the Periodic Table and follow some simple rules.Because (..., Calcium phosphate is a calcium salt of phosphoric acid with a chemical formula Ca 3 (PO 4) 2. It is also known as Calcium phosphate tribasic or Tricalcium Phosphate. Calcium phosphate appears as a white amorphous or crystalline powder that is odourless and tasteless. It is insoluble in ethanol, and acetic acid but soluble in dilute nitric acid ...