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\( N a H C O_{3} \) can be used on its own to make cakes or bread. Baking powder is more commonly used, and contains \( N a H C O_{3}, C a\left(H_{2} P O_{4}\right)_{2} \) and starch. An improved combination baking powder contains about \( 40 \% \) starch, \( 30 \% \) \( N a H C O_{3} 20 \% N a A l\left(S O_{4}\right)_{2} \) and \( 10 \% \) \( \boldsymbol{C a}\left(\boldsymbol{H}_{2} \boldsymbol{P} \boldsymbol{O}_{4}\right)_{2} \) Answer the following questions based on above study. n improved baking powder, \( N a A l\left(S O_{4}\right)_{2} \) is used for :

1. makes the decomposition of \( \operatorname{NaH} \mathrm{CO}_{3} \) faster
2. slows the decomposition of \( N a H C O_{3} \)
3. acts as filler
4. makes the bread rise

Correct answer: slows the decomposition of \( N a H C O_{3} \)

Solution

NaAl(SO4)2 is included to reduce the premature breakdown of NaHCO3, helping the powder stay effective during storage. This controlled decomposition prevents loss of CO2 before baking.

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