Question

the gas liberated when sodium carbonate reacts with diute hydrochloric acid is passed thrug lime water a whte precipitate is formed But when the sae gas is pased through lime water in excess precipitate is not visible?why​

Answer 1

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When dilute hydrochloric acid reacts with sodium hydrogen carbonate, Carbon dioxide gas is liberated. We recognize the presence of carbon dioxide by passing it through lime water which turns milky or a white precipitate of calcium carbonate is formed.