The task of analytical chemistry 39

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What is the mass of the primary standard K2Cr2O7 (mol. weight 294,2) needed to prepare exactly 2 years 0,1200 solution? During the titration with the dichromate half-reaction proceeds Cr2O7(2-) + 14H(+) + 6e = 2Cr(5+) + 7H2O

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