Question

A compound X of sodium forms a white powder. It is a constituent of

baking powder and is used in some antacid prescriptions. When heated, X gives out a gas and steam. The gas forms a white precipitate with lime

water. Write the chemical formula and name of X and the chemical

equation for its decomposition on heating. What is its role in baking

powder and in antacids.​

Answer 1

Answer:

Baking powder (NaHCO3) salt X is commonly used in bakery products. On heating, it forms sodium carbonate (Na2CO2), Y and CO2 gas, Z is evolved. When CO2 gas, Z is passed through lime water, it forms calcium carbonate (CaCO3), which is slightly soluble in water making it milky

X - NaHCO3; Y- Na2CO3; Z - CO3

2 NaHCO3 + heat → Na2CO3 + H2O + CO2

NA2CO3.10H2O + heat → Na2Co3 + 10H2O