Permanent hardness of water can be removed by_________________?
Correct answer: A. All A , B, and C.
- A. All A , B, and C.
- B. Treating it with zeolites
- C. Passing it through sodium hexametaphosphate
- D. Addition of soda ash to it
Explanation
Soda ash precipitates calcium and magnesium carbonates, zeolites exchange hardness ions for sodium, and sodium hexametaphosphate sequesters them. Therefore all three listed treatments can control or remove permanent hardness in the standard textbook sense.
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