424. Determine the mass concentration of Na2SO4 * 10H2O in 1 g / l of electrolyte, if 50.00 ml of a solution of Pb (NO3) 2 with a concentration of 0.1000 mol / l is added to 10.00 ml of this solution, the excess of Pb (NO3) 2 is titrated 10 .00 ml of a solution of complexone III with a concentration of 0.09000 mol / l.

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