In lime-soda ash softening, which compound is formed by reaction of lime with carbonate hardness?

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Multiple Choice

In lime-soda ash softening, which compound is formed by reaction of lime with carbonate hardness?

Explanation:
In lime-soda ash softening, carbonate hardness is removed by turning dissolved bicarbonate and carbonate into an insoluble solid. Lime provides calcium ions that react with the carbonate species to form calcium carbonate, which precipitates out of the water. A typical view is Ca(HCO3)2 + Ca(OH)2 → 2 CaCO3↓ + 2 H2O, or Ca(OH)2 + 2 HCO3− → CaCO3↓ + CO2 + 2 H2O. That solid calcium carbonate is what carries away the carbonate hardness, leaving softer water behind. The other substances listed are not formed as the precipitated product of this reaction.

In lime-soda ash softening, carbonate hardness is removed by turning dissolved bicarbonate and carbonate into an insoluble solid. Lime provides calcium ions that react with the carbonate species to form calcium carbonate, which precipitates out of the water. A typical view is Ca(HCO3)2 + Ca(OH)2 → 2 CaCO3↓ + 2 H2O, or Ca(OH)2 + 2 HCO3− → CaCO3↓ + CO2 + 2 H2O. That solid calcium carbonate is what carries away the carbonate hardness, leaving softer water behind. The other substances listed are not formed as the precipitated product of this reaction.

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