67. 500 ml of copper solution was passed through a column filled with 5 g of cation exchanger. Outgoing portions of the solution of 50.0 ml were titrated iodometrically. The first two servings did not contain copper. For titration from 3 to 10 portions, 5.0 12.0 17.6 20.0 25.2 30.5 39.2 and 39.22 ml of 0.02 N sodium thiosulfate solution were used, respectively. Plot copper concentration versus filtrate volume. Calculate the total dynamic capacity of the cation exchange resin for copper ions.

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