Question

A compound ‘X’ is a constituent of baking powder. It is used as an antacid. When ‘X’ is heated it gives out a gas ‘Y’ which, when passed through lime water turns it milky and salt ‘Z’ is formed which is the main constituent of washing powder. Identify X, Y and Z. Write the balanced chemical equations for the reactions involved.

Answer 1

X-Na2CO3
Y-CO2
Z-CaCO3
Na2CO3 on heating gives anhydrous Na2CO3+ H2O + CO2
Ca(OH)2 + CO2 gives CaCO3