Question

why is dilute sulphuric acid added while preparing a standard solution of mohrs saltwhy heating is not required in F.A.S. and potassium permanganate titration
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Answer 1

Answer:

→  Ferrous ions of Mohr's salt undergo hydrolysis in aqueous solution. To     prevent the hydrolysis, Conc. H2SO4 needs to be added to the Mohr's salt   crystals during the preparation of its standard solution.

→  Another reason is also to prevent the oxidation of Fe2+ ions of Mohr's salt     to Fe3+ ions.