Calculate the atomic mass of alkali metal

Posted on 2014-01-20 18:08:00 in Chemistry by SIMON

A mixture (4.0 g) of KMnO₄ and K₂CR₂O₇ was dissolved in water and the solution made to 1 litre. 20 ml of this solution was treated with KI solution in presence of dil. H₂SO₄. The liberated iodine was titrated against 0.1 N sodium thiosulphate solution which required 25.2 ml for complete titration. Calculate the atomic mass of alkali metal.

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