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?
During the preparation of Mohr’s salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe2+ ion?
Updated On: Mar 26, 2025
- dilute hydrochloric acid
- concentrated sulphuric acid
- dilute nitric acid
- dilute sulphuric acid
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The Correct Option is D
Solution and Explanation
Step 1: The Role of Acids in Preventing Hydrolysis
The hydrolysis of Fe²⁺ can lead to the formation of Fe(OH)₂, which is insoluble. To prevent this, we need an acidic medium.
Step 2: Acid Used in the Preparation of Mohr’s Salt
- Dilute sulfuric acid: It is used because it does not oxidize Fe²⁺ to Fe³⁺, and it maintains iron in its divalent state.
- Concentrated sulfuric acid: Would oxidize Fe²⁺ to Fe³⁺, which is undesirable.
- Dilute nitric acid and hydrochloric acid: These are not typically used as they can lead to unwanted reactions.
Step 3: Conclusion
The correct answer is:
Option (4): Dilute sulfuric acid.
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