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Lead(II) phosphate is an ionic compound with chemical formula Pb 3 (P O 4) 2.Lead(II) phosphate is a long-lived electronically neutral reagent chemical. [2] Despite limited tests on humans, it has been identified as a carcinogen based on tests on animals conducted by the EPA. [3]
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.It is also known as tribasic calcium phosphate and bone phosphate of lime (BPL).
A general formula for such cyclic compounds is [HPO 3] x where x = number of phosphoric units in the molecule. When metaphosphoric acids lose their hydrogens as H +, cyclic anions called metaphosphates are formed. An example of a compound with such an anion is sodium hexametaphosphate (Na 6 P 6 O 18), used as a sequestrant and a food additive.
4] 3− is derived from phosphoric acid by the removal of three protons H +. Removal of one proton gives the dihydrogen phosphate ion [H 2 PO 4] − while removal of two protons gives the hydrogen phosphate ion [HPO 4] 2−. These names are also used for salts of those anions, such as ammonium dihydrogen phosphate and trisodium phosphate.
The compounds are almost insoluble in water, weak acids, and (NH 4) 2 S/(NH 4) 2 S 2 solution is the key for separation of lead from analytical groups I to III elements, tin, arsenic, and antimony. The compounds dissolve in nitric and hydrochloric acids, to give elemental sulfur and hydrogen sulfide, respectively. [7]
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If a pure compound is desired, PbO can be removed by a potassium hydroxide solution: PbO + KOH + H 2 O → K[Pb(OH) 3] Another method of preparation relies on annealing of lead(II) carbonate in air: 6 PbCO 3 + O 2 → 2 Pb 3 O 4 + 6 CO 2. Yet another method is oxidative annealing of white lead: 3 Pb 2 CO 3 (OH) 2 + O 2 → 2 Pb 3 O 4 + 3 CO 2 ...
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