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Freshly ground copper(II) phosphate intended for use in blue paint
| IUPAC name
| Other names
|Molar mass|| 380.580722 g/mol (anhydrous)|
434.63 g/mol (trihydrate)
|Appearance|| Light bluish-green powder (anhydrous)|
Blue or olive crystals (trihydrate)
Soluble in ammonia
Soluble in aq. ammonia
Slightly soluble in acetone
Insoluble in alcohols
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Copper(II) phosphate, or cupric phosphate, is a chemical compound with the formula Cu3(PO4)2. It is a light blue powdery compound that is insoluble in water.
Copper(II) phosphate is a light blue, powdery substance that is insoluble in water and ethanol, but soluble in ammonia and mineral acids.
Copper(II) phosphate is usually unavailable for sale as it has very few applications. It is however extremely easy to prepare with OTC chemicals.
- 3 CuSO4 (aq) + 2 Na3PO4 (aq) → 2 Cu3(PO4)2 (s) + 3 Na2SO4 (aq)
A different preparation involves reacting copper carbonate with phosphoric acid:
- 3 Cu2CO3(OH)2 + 4 H3PO4 → 2 Cu3(PO4)2 + 3 CO2 + 9 H2O
Monoammonium phosphate also works for this preparation.
- Copper compounds collection
- Paint pigments
- Copper (II) phosphate can be reduced to copper phosphide, which can be used to isolate elemental phosphorous by heating it: 4 Cu3P2 → 4 Cu3P + P4
Like all copper compounds, copper(II) phosphate is mildly toxic, but since it is insoluble it is less of a concern than soluble compounds.
Copper(II) phosphate should be stored in closed bottles.
Copper phosphate should be disposed just like any other copper compound.