In lime softening, the precipitated solids are which of the following?

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Multiple Choice

In lime softening, the precipitated solids are which of the following?

Explanation:
Lime softening removes hardness by turning dissolved calcium and magnesium into insoluble carbonates as the water pH is raised with lime. When lime (Ca(OH)2) increases the pH, carbonate ions become available and react with calcium to form calcium carbonate, CaCO3, which precipitates out. Magnesium can likewise form magnesium carbonate, MgCO3, at high pH when carbonate is present, and it also precipitates as a solid. These insoluble carbonates settle from the water, reducing both calcium and magnesium hardness.

Lime softening removes hardness by turning dissolved calcium and magnesium into insoluble carbonates as the water pH is raised with lime. When lime (Ca(OH)2) increases the pH, carbonate ions become available and react with calcium to form calcium carbonate, CaCO3, which precipitates out. Magnesium can likewise form magnesium carbonate, MgCO3, at high pH when carbonate is present, and it also precipitates as a solid. These insoluble carbonates settle from the water, reducing both calcium and magnesium hardness.

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