Question

why is dilute sulphuric acid added while preparing a standard solutions of Mohr's Salt?
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Answer 1

Answer:

sulphuric acid in the preparation of a standard solution of Mohr's saltin redox titration is to prevent hydrolysis of the Fe2+ ions. Ferrous ions of Mohr's salt undergo hydrolysis in aqueous solution. Another reason is also to prevent the oxidation of Fe2+ ions of Mohr's salt to Fe3+ ions