Take an aqueous sodium bicarbonate solution in a test tube and heat it above $80^{o} C$ . What do you observe if the evolved gas is passed through lime water?

It remains uneffected

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It turns red in colour

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It turns milky white

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It becomes milky white in colour

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Solution

The correct option is C It turns milky white
When sodium hydrogen carbonate $(N a H C O_{3})$ is heated above 80°C, it begins to decompose forming sodium carbonate $(N a_{2} C O_{3})$ , water and carbon dioxide.

$2 N a H C O_{3} (s) \to N a_{2} C O_{3} (s) + C O_{2} (g) + H_{2} O (g)$

When you pass carbon dioxide through limewater
$(C a (O H)_{2})$ , it turns milky because calcium carbonate $(C a C O_{3})$ , an insoluble white solid precipitates out of the solution.

$C a (O H)_{2} (a q) + C O_{2} (g) \to C a C O_{3} (s) + H_{2} O (l)$

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