Question

In deionization process water is usually first passed through the cation exchanger and then through anion exchanger. Give reason.​

Answer 1

Explanation:

If water first pas through an anion exchanger all the cations will convert to Hydroxides e.g Ca(OH)2, Mg(OH)2,NaoH etc. Because of Hydroxide the water pH will be high. Hence , calcium Hydroxide will be precipitated and block the exchanger.

Answer 2

Concept introduction:

Deionization is a physical procedure that employs ion exchange resins that have been particularly developed to remove mineral ions. Since dissolved salts make up the bulk of water contaminants, deionization produces highly pure water that is often comparable to distilled water.

Explanation:

Given that, in deionization process water is usually first passed through the cation exchanger and then through anion exchanger.

We have to find, why In deionization process water is usually first passed through the cation exchanger and then through anion exchanger.

According to the question,

If we pass water from anion exchanger then all the ion anion will be exchanged with hydroxide and then these hydroxides will react with sodium and magnesium forming metal hydroxide and then precipitate to block the ion exchanger. Hence in deionization process water is usually first passed through the cation exchanger and then through anion exchanger.

Final Answer:

Metal hydroxides will block the ion exchanger hence in deionization process water is usually first passed through the cation exchanger and then through anion exchanger.

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