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Earlier discussion
2 older comments kept for context.
CHUKA MIKE
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CHUKA MIKE
When carbondioxide is bubbled into limewater a white precipitate is formed. If the passage of the gas is continued, the precipitate disappears. The reason for this is calcium carbonate is formed which on reaction with further carbondioxide forms solube calcium hydrogen carbonate.
When excess of carbon dioxide gas is passed through lime water then the white precipitate calcium carbonate formed first dissolves due to the formation of a soluble salt calcium hydrogen carbonate (Ca(HCO3)2, and the Solution becomes clear again.