25. Solving a chemistry problem

Product description

• For complete desalting by the ion exchange adsorption method, V m3 of natural or diluted wastewater is sequentially passed through columns containing m1, kg of cation exchanger in the H-form, DOEcat mol-equiv/kg and m2 of anion exchanger in the OH-form, DOEanno mol-equiv/ kg (Table 3.2)
• Write the equations of ion exchange reactions occurring on a cation exchanger and anion exchanger with the participation of ions of each salt.
• Determine in what sequence the ions will be adsorbed on the cation exchanger and anion exchanger, arranging them in a row according to decreasing adsorbability. 3) Convert the concentration of salts in an aqueous solution, expressed in g/l, into the molar concentration of equivalents (mol equiv/l) and determine the total concentration of salts in (mol equiv/l).
• Calculate the quantity (m1 and m2, kg) of cation exchanger and anion exchanger sufficient to desalinize a given volume of water.

Problem number DOEcationite mol eq/kg DOEanionite mol eq/kg v, m3 Salt formula Concent. Sal, g/l

321 4.2 3.5 100 NaCl MgSO4 Ca(HCO3)2 FeCl3 0.025 0.04 0.012 0.006

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