Properties of Copper Sulphate:Physical properties:
1. The anhydrous salt is colorless however the hydrated salt is blue in color.
2. It eagerly dissolves in water however is insoluble in alcohol.Chemical Properties:
1. Action of Heat:
On heating CuSO4.5H2O lose its water of crystallization and decomposes at 720°C to provide cupric oxide and sulphur trioxide. 2. Action of ammonia:
Copper sulphate provides deep blue color with NH4OH making complex compound.
CuSO4 + 4NH4OH → [Cu (NH3)4]SO4 + 4H2O3. Action of KI:
Whenever KI is added to a solution of CuSO4, a white precipitate of cuprous iodide is generated.
CuSO4 + 2KI → CuI2 + K2SO4 (Unstable)2CuI2 → Cu2I2 + I2 (White ppt)4. Action with KCN:
The yellow precipitate of cupric cyanide is primary formed with KCN and it decomposes to provide cyanogen gas.CuSO4 + 2KCN → Cu(CN)2 + K2SO42Cu(CN)2 → Cu2(CN)2 + (CN)2 cyanogen5. Action of alkalies:
With alkalies, a pale blue precipitate of copper hydroxide is created.
CuSO4 + 2NaOH → Cu(OH)2+ Na2SO4 Pale blue precipitate6. Action with H2S:
With H2S it provides a black precipitate of the copper sulphide.
CuSO4 + H2S → CuS + H2SO4 (Black ppt)
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