Question

What is formula for chromium (III) phosphate trihydrate and cobalt (II) phosphate octahydrate

Answer 1

1. Chromium (III) phosphate trihydrate: CrPO₄•3H₂O

2. Cobalt (II) phosphate octahydrate: Co₃(PO₄)₂•8H₂O

Step-by-step explanation:

Chromium (III) phosphate is an inorganic chemical compound having the chemical formula CrPO₄, in which the chromium metal is present in the +3 oxidation state. The anhydrous chromium (III) phosphate is green in color.

The trihydrate chromium (III) phosphate has the chemical formula CrPO₄•3H₂O.

Cobalt (II) phosphate, also called cobalt violet, is an inorganic chemical compound having the chemical formula Co₃(PO₄)₂, in which cobalt is present in +2 oxidation state.

The octahydrate cobalt (II) phosphate has the chemical formula Co₃(PO₄)₂•8H₂O

Answer 2

The formula for chromium (III) phosphate trihydrate is CrPO4- 3H20. This compound if in the anhydrous state, exists as a green crystal whereas a hydrated form violet crystal. The formula for cobalt(II) phosphate octahydrate is Co3(PO4)2•8H2O.