4. Calculate the amount of cation exchanger containing the ionogenic group SO3H in the H form required to purify 500 m3 of natural water containing 0.021 g/l NaCl; 0.04 g/l MgCl2 and 0.15 g/l Ca(HCO3)2. The total exchange capacity of the cation exchanger is 4.2 mol/kg.

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