4. Sulfuric acid and 50 ml of a 0.1480 N solution of KI were added to 30 ml of a K2CrO7 solution, the excess of which was titrated in an acid medium with 21.4 ml of a 0.0962 N solution of KMnO4. Find the mass of dichromate anions in the initial solution. give four significant figures in your answer.
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