Estimation of ferric iron by potassium dichromate
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Principle: Ferric Iron is reduced to ferrous iron by stannous chloride in the present of Hydrochloric acid at a temperature of 70-900C. The ferrous iron formed is titrated with standard Potassium dichromate solution in the presence of Sulphuric acid and Phosphoric acid using diphenylamine as indicator.
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it is known as the estimation of ferric iron oxide by potassium dichromate
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