Rohit wanted to make limestone in the lab artificially. He passed CO2 gas in lime water. To his surprise, he could not find white insoluble compounds as expected, rather the resulting solution was clear and transparent. Find out what went wrong and write the chemical equations involved. Predict the nature of CO2 gas by this reaction.
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Rohit passed CO2 gas in excess which turned the precipitate of Calcium carbonate (limestone) into calcium hydrogen carbonate which is transparent.
- When he passed CO2 in lime water, it turns lime water milky at first.
Ca(OH)2 + CO2 → CaCO3 + H2O
- When he continued passing CO2 gas, it turned the Calcium carbonate (limestone) formed into calcium hydrogen carbonate which is transparent.
CaCO3 + CO2 + H2O → Ca(HCO3)2
- Its reaction with lime water to form a salt confirms that it is an acidic oxide.
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