Lime precipitation of noncarbonate hardness forms which noncarbonate salts?

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Multiple Choice

Lime precipitation of noncarbonate hardness forms which noncarbonate salts?

Explanation:
Lime softening targets noncarbonate hardness, which consists of calcium and magnesium salts of ions other than carbonate (like sulfate and chloride). When lime (Ca(OH)2) is added, calcium ions become available to pair with those anions. Calcium can form calcium sulfate (CaSO4), a sparingly soluble salt that tends to precipitate and carry away sulfate-based hardness. It can also form calcium chloride (CaCl2), a noncarbonate salt associated with chloride in the water. Na2SO4 would not be formed by this process because sodium isn’t introduced by lime; it would remain in solution. So the noncarbonate salts produced by lime precipitation are CaSO4 and CaCl2.

Lime softening targets noncarbonate hardness, which consists of calcium and magnesium salts of ions other than carbonate (like sulfate and chloride). When lime (Ca(OH)2) is added, calcium ions become available to pair with those anions. Calcium can form calcium sulfate (CaSO4), a sparingly soluble salt that tends to precipitate and carry away sulfate-based hardness. It can also form calcium chloride (CaCl2), a noncarbonate salt associated with chloride in the water. Na2SO4 would not be formed by this process because sodium isn’t introduced by lime; it would remain in solution. So the noncarbonate salts produced by lime precipitation are CaSO4 and CaCl2.

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