4. 10 ml of sodium sulfate solution was passed through a column filled with an anion exchange resin weighing 25 g. The flowing eluate with a volume of 150 ml, together with washing distilled water, was collected in a glass and titrated potentiometrically with a 0.053 N acid solution. The titration took 7.6 ml of acid solution. Determine the capacity of the anion exchanger for sulfate ions and the mass of anhydrous sodium sulfate in the original flask.

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