Question

Acetic acid was added to a solid 'x' kept in a test tube . a colourless and odourless gas 'y' was evolved . this gas was passed in a solution 'z' which turned milky. identify x,yand z . also write what will happen if y is passed in z in excess ?

Answer 1

Compound X is sodium bicarbonate (NaHCO3) and Y gas is CO2 gas . CO2 gas will turn lime water milky by the formation of CaCO3. The reaction is :
CH3COOH + NaHCO3 → CH3COONa + CO2 + H2O

Passing CO2 through calcium hydroxide
Ca(OH)2+CO2 →CaCO3+H2O

On passing excess carbondioxide
CaCO3+CO2+H2O →Ca(HCO3)2
Z →Ca(OH)2
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