During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following a

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Question

During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe2+ ion? (1) dilute hydrochloric acid (2) concentrated sulphuric acid (3) dilute nitric acid (4) dilute sulphuric acid

Accepted Answer

Correct Answer: d — dilute sulphuric acidStep-by-step Solution:Mohr's salt is FeSO₄·(NH₄)₂SO₄·6H₂O. Fe²⁺ ions are prone to hydrolysis in aqueous solution, forming Fe(OH)⁺ and H⁺, and can also be oxidized by air. To prevent hydrolysis, a small amount of dilute sulfuric acid (H₂SO₄) is added. The H⁺ ions from the acid suppress the hydrolysis by shifting the equilibrium Fe²⁺ + H₂O ⇌ Fe(OH)⁺ + H⁺ to the left (common ion effect). Dilute HCl is avoided because Cl⁻ ions can form complexes with Fe²⁺ and may cause interference. Concentrated H₂SO₄ is too strong and may oxidize Fe²⁺ to Fe³⁺. Dilute HNO₃ is an oxidizing agent and would oxidize Fe²⁺. Thus, dilute sulphuric acid is the correct choice.Key Concepts: Hydrolysis of Fe²⁺ ions, prevention of hydrolysis by adding acid (common ion effect), preparation of Mohr's salt, choice of acid to avoid side reactions (oxidation, complexation).

During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe2+ ion? (1) dilute hydrochloric acid (2) concentrated sulphuric acid (3) dilute nitric acid (4) dilute sulphuric acid

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During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe2+ ion? (1) dilute hydrochloric acid (2) concentrated sulphuric acid (3) dilute nitric acid (4) dilute sulphuric acid

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