(a) What is the common name of sodium hydrogen carbonate?

(b) What happens when a solution of sodium hydrogen carbonate is heated? Write equation of the reaction involved.

(c) Explain why sodium hydrogen carbonate is used as an antacid.

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Solution

(a) The common name of sodium hydrogen carbonate is baking soda.

(b)When a solution of sodium hydrogen carbonate is heated then it decomposes to give sodium carbonate with the evolution of carbon dioxide gas.

$2 N a H C O_{3} h e a t ⟶ N a_{2} C O_{3} + C O_{2} + H_{2} O$

(c) Sodium hydrogen carbonate is used as an antacid because it neutralises the excess acid present in the stomach and relieves indigestion.

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