7. Determine how much (in kg) of sea water can be desalted using chromatographic columns containing 1 kg of cation exchanger and 1 kg of anion exchanger, if the dynamic exchange capacity of each ion exchanger is 3.5 eq / kg. The concentration of salts prevailing in water, in% (mass): NaCl-2.74, MgCl2 - 0.33 MgSO4-0.23.

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