While preparing crystals of Mohr's salt,dil. $H_2SO_4$ is added to a mixture of ferrous sulphate and ammonium sulphate,before dissolving this mixture in water,dil. $H_2SO_4$ is added here to:
- Aprevent the hydrolysis of ferrous sulphate
- Bprevent the hydrolysis of ammonium sulphate
- Cmake the medium strongly acidic
- Dincrease the rate of formation of crystals
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