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Sparingly soluble carbonate salts of alk...

Sparingly soluble carbonate salts of alkaline earth metals become easily soluble in water in presence of `CO_2` . Why?

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Sparingly soluble carbonate salts of alkaline earth metals are converted into soluble bicarbonate salts in presence of `CO_2`. So, these salts become easily soluble in water.
`CaCO_3(s) + CO_2(g) + H_2O (l) to Ca(HCO_3)_2 (aq)`
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