what happens if a drop of water is poured over anhydrous copper sulphate
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what happens if a drop of water is poured over anhydrous copper sulphate
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The anhydrous copper sulphate without any moist or water molecules in it - is a light greenish white powder. When a water drop falls on the anhydrous powder, water molecules are absorbed by the sulphate.
The pentahydrate form CuSO₄ . 5 H₂O of copper sulphate is a beautiful bright shining blue crystalline solid.
Copper sulphate exists in various degrees of hydration ie., different number of molecules of water associated with one molecule of copper sulphate: like trihydrate and heptahydrate - which is green.
Cu SO₄ dissolves in a lot of water (not just drops) giving out heat, and forms [ Cu (H₂O)₆ ]²⁺ and SO₄²⁻ ions.
Cu SO₄ + 5 H₂O ==> ( Cu SO₄. 5 H₂O ) + heat
Cu SO₄ + 6 H₂O ==> Cu (H₂O)₆²⁺ + SO₄²⁻ + heat
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CuSO4.5H2O(s)⇌ CuSO4(s) + 5H2O(l)it is an endothermic reaction