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JAMB Chemistry 2011 Paper

Question : 35

Total: 47

The constituents of baking powder that makes the dough to rise is

Solution:

Concept:

Baking powder produces carbon dioxide gas, which makes dough rise.

Explanation:

Baking powder contains sodium hydrogencarbonate,

\mathrm{NaHCO}_3

On heating or in the presence of moisture and acid, it decomposes to release carbon dioxide gas:

2\mathrm{NaHCO}_3 \rightarrow \mathrm{Na}_2\mathrm{CO}_3 + \mathrm{H}_2\mathrm{O} + \mathrm{CO}_2

The carbon dioxide gas trapped in the dough causes it to rise.

Answer:

\mathrm{NaHCO}_3

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