Readimgs to prepare a pure sample of ferrous ammonium sulphate
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Take a 250 ml beaker and wash it with water. Transfer 7.0 g ferrous sulphate and 3.5 g ammonium sulphate crystals to it. Add about 2-3 ml of dilute sulphuric acid to prevent the hydrolysis of ferrous sulphate. In another beaker boil about 20 ml of water for about 5 minutes to expel dissolved air.
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