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, Xgives out a gasYand steam. The gas Yforms a white precipitate with limewater. Write the chemical formula and name of Xand the chemical equation for both the reactions.

Answer 1

Explanation:

(i) Compound X is baking soda (NaHCO3)

(ii) When heated, it gives sodium carbonate CO2 and water.

2NaHCO3 → Na2C03 + CO2 + H2O.

(iii) When used in baking powder and the salt is used a source of CO2. When added to the stomach this reaction occurs to neutralized axise.

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Answer 2

The compound X is Sodium Bicarbonate, i.e., baking soda.

It has the molecular formula NaHCO3.

- Sodium bicarbonate is used in antacids.

- Upon heating, it gives out Na2CO3, CO2 and water as follows:

2 NaHCO3 → Na2C03 + CO2 + H2O

- So, the gas Y is CO2.

- When it is passed through lime water, it turns lime water milky due to the formation of white ppt of CaCO3 as follows:

Ca(OH)2 + CO2 → CaCO3 + H2O