Question

the pale blue precipitate obtained when copper 3 sulphate reacts with sodium hydroxide​

Answer 1

Answer:

Copper hydroxide.

Explanation:

The pale blue precipitate that is obtained on reaction of Copper sulphate with caustic soda is of copper hydroxide, which is soluble in excess ammonium hydroxide solution, forming an azure blue solution, tetra-ammine copper salt. This method is used for qualitative analysis of copper salts.

Reaction: CuSO₄ + 2NaOH -----> Cu(OH)₂ (pale blue) + Na₂SO₄

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Answer 2

Explanation:

The pale blue precipitate is copper hydroxide..

the reaction is below :

CuSO4+NaOH------>Na2SO4+Cu(OH)2