LAQ : Give the principle to prepare H2S. Mention its reaction with an aqueous solution of CuSO4.

Question

Give the principle to prepare H₂S. Mention its reaction with an aqueous solution of CuSO_4.

Answer

In the laboratory, H₂S is prepared by the action of dilute sulphuric acid with ferrous sulphide at room temperature.

Equation : FeS + H₂SO₄ → FeSO₄ + H₂S

When hydrogen sulfide (H₂S) reacts with an aqueous solution of CuSO₄ (copper sulfate), it forms a precipitate of CuS (copper sulfide) and sulfuric acid (H₂SO₄) is also produced as a by-product. The balanced chemical equation for this reaction is:

H₂S (g) + CuSO₄ (aq) → CuS (s)↓ + H₂SO₄ (aq)