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copper sulphate

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copper(II) sulphate

Substance usually found as a blue, crystalline, hydrated salt CuSO4.5H2O (also called blue vitriol). It is made from the action of dilute sulphuric acid on copper(II) oxide, hydroxide, or carbonate.

CuO + H2SO4 + 4H2O → CuSO4.5H2O

When the hydrated salt is heated gently it loses its water of crystallization and the blue crystals turn to a white powder. The reverse reaction is used as a chemical test for water.

CuSO4.5H2O ⇌ CuSO4 + 5H2O



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? Mentioned in ? References in periodicals archive
 
blue cave by filling it with 90,000 litres of liquid copper sulphate which after time encrusted each surface of the apartment with crystals.
Is it Wobbly Egg Man's turn for the Turner? by The Daily Mail (London, England)
Hiorns is nominated primarily for Seizure, a brilliant installation in which he turned the interior of a south London council flat into a crystal cave with copper sulphate.
YES, IT'S THE BEST OF BRITISH ART; EXHIBITION by The Evening Standard (London, England)
Wise growers worked fast to treat their vines with both copper sulphate and sulphur sprays and nipped the problem in the bud.
Storms, smoke and mildew ruin vineyard crops by The Journal (Newcastle, England)
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