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Washing Soda

NaHCO3 can be...

Question

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

In improved baking powder, $N a A l (S O_{4})_{2}$ is used for :

makes the decomposition of

N a H C O_{3}

faster

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slows the decomposition of

N a H C O_{3}

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acts as filler

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makes the bread rise.

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Solution

The correct option is B slows the decomposition of $N a H C O_{3}$
Acid in a baking powder can be either fast-acting or slow-acting. $N a A l (S O_{4})_{2}$ is a weak acid, it react with sodiumbicarbonate to produce $C O_{2}$ gas.
$N a A l (S O_{4})_{2} + 3 N a H C O_{3} \to A l O H_{3} + 2 N a_{2} S O_{4} + 3 C O_{2}$

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