Science, asked by ChinuAfu, 3 months ago

The
gas liberated when sodium carbonate reacts with dilute hydrochloric acid
is passed through lime water, a white precipitate is formed. But when the same
gas
is passed through lime water in excess, precipitate is not visible. Why?​

Answers

Answered by Anonymous
75

The gas evolved when sodium carbonate reacts with dilute hydrochloric acid is Carbon dioxide (CO2).

This gas when bubbled through limewater forms a milky white insoluble precipitate of Calcium Carbonate, but when excess of Carbon dioxide is passed into the limewater, another reaction takes place in which calcium carbonate, excess carbon dioxide and water react to produce soluble Calcium Bicarbonate (Ca(HCO3)2 ). This dissolves in the limewater and hence the precipitate disappears on passing excess of Carbon Dioxide gas.

Reaction:

CO2 + Ca(OH)2 -----------> CaCO3 (milky white ppt) + H2O

CaCO3 + CO2 (excess) + H2O -----------> Ca (HCO3)2 (soluble in water)

Answered by shankarmurthybm032
8

Answer:

because it soluble in water....hope it helps guys....

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