91. What are ion exchange sorbents? 500 ml of calcium salt solution were passed through a column with 5 g of cationite. When determining the Ca2 ion in the eluate (filtrate) in 50 ml portions, the following values ​​of the molar concentration of the equivalent were obtained:
Vф, ml 50 50 50 50 50 50 50 50 50 50
Сэ 0 0 0 0 0.003; 0.008; 0.015; 0.025; 0.04; 0.05.
Determine the dynamic capacity of the cationite for calcium

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