Home
Class 12
CHEMISTRY
When aqueous KCN is added to a solution ...

 When aqueous KCN is added to a solution of copper sulphate, a white precipitate, soluble in a excess of KCN is formed. No precipitate is formed when `H_(2)S` is passed into it Explain.

Text Solution

Verified by Experts

It is due to formation of a stable complex which does not ionize to give free Cu?that can give precipitate with `H_(2)S`
`Cu^(2+)+S^(2-)toCuSdarr`
`CuSO_(4)+2kCNtoCu(CN)_(2)darr+k_(2)SO_(4)`
`2Cu(CN)_(2)to2CuCN+(CN)_(2)`
Promotional Banner

Similar Questions

Explore conceptually related problems

When KCN is added to CuSO_(4) solution:

When phosphine is passed through aqueous solution of copper sulphate, the product is

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H_(2)S (g) is passed through this solution?

When of the following precipitate is soluble in excess of NH_(3) solution?

When aqueous sodium hydroxide was added to an aqueous solution of X, a green precipitate, insoluble in an excess of aqueous sodium hydroxide, was formed. When aqueous barium nitrate was added to a second sample of aqueous X a white precipitate was obtained. Which one of the following could be X?

When a small amount of HCl is added to an aqueous solution of BiCl_3 , a white precipitate is formed. This is due to formation of

When zinc granule is dipped into copper sulphate solution, copper is precipitated because :

What happens when AgCl is dissolves in excess of KCN solution

When excess of aqueous KCN solution is added to an aqueous solution of copper sulphate , the complex [Cu(CN)_(4)]^(2-) is formed . On passing H_(2)S gas through this solution no precipitate of CuS is formed because

When H_2S is passed through acidified zinc sulphate solution, white precipitate of zinc sulphide is not formed.