How do you prepare copper sulphate crystals from a mixture of charcoal and black copper oxide
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The carbon in the charcoal reduces the black copper oxide to reddish-brown copper. The lid must not be removed until the crucible is cool or the hot copper will be re-oxidized by air. Take dilute sulphuric acid in a beaker and heat it on wire gauze. Add cupric oxide in small quantities at a time, with stirring till no more of it dissolves and the excess compound settles to the bottom. Filter it hot and collect the filtrate in a china dish. Evaporate the filtrate by heating to the point of crystallization and then allow it to cool and collect the crystals of copper sulphate pentahydrate.
Reaction: CuO + H2SO4 → CuSO4 + H2O
CuSO4 + 5H2O → CuSO4. 5H2O
Explanation:
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