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Standard XII

Chemistry

Decarboxylation

Baking powder...

Question

Baking powder used to make a cake is a mixture of starch, $N a H C O_{3}$ and $C a (H_{2} P O_{4})_{2}$ . The function of $C a (H_{2} P O_{4})_{2}$ is:

to slow down the release of

C O_{2}

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being acidic in nature and give

C O_{2}

when moistened with

N a H C O_{3}

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to act as a fille

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none of these

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Solution

The correct option is C being acidic in nature and give $C O_{2}$ when moistened with $N a H C O_{3}$
The most likely function of the dihydrogen phosphate ion is to act as an acid. That is, when the liquid ingredients of a dough are added, it donates a proton to the bicarbonate ion to form carbonic acid. The carbonic acid will then decompose into water and carbon dioxide. The gaseous carbon dioxide will help to leave the dough.

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Similar questions

Q. Assertion :Baking powder contains

N a H C O_{3}

C a (H_{2} P O_{4})_{2}

, starch and

N a A l (S O_{4})_{2}

. Reason:

\begin{matrix} N a H C O_{3} \end{matrix}

C a (H_{2} P O_{4})_{2}

is acidic in aqueous solution. Acidic solution of

C a (H_{2} P O_{4})_{2}

liberates

C O_{2}

on reaction with

N a H C O_{3}

Starch ] as a filter

N a A l (S O_{4})^{2}

retarder so that

C O_{2}

is given off more slowly while preparing cake or bread.

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.

C a (H_{2} P O_{4})_{2}

in baking powder:

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.

Rise in bread and cakes is due to______ when it decomposes between

50^{o} C

and

100^{o} C

Q. The more commonly used baking powder contains about 30%

N a H C O_{3}

, 20%

N a A l (S O_{4})_{2}

, 10%

C a (H_{2} P O_{4})_{2}

and 40% starch. Which of the following statements are correct?

C a (H_{2} P O_{4})_{2}

in baking powder:

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Baking powder used to make a cake is a mixture of starch, NaHCO3 and Ca(H2PO4)2. The function of Ca(H2PO4)2 is:

Baking powder used to make a cake is a mixture of starch, $N a H C O_{3}$ and $C a (H_{2} P O_{4})_{2}$ . The function of $C a (H_{2} P O_{4})_{2}$ is: