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Standard XII

Chemistry

Preparations and Uses of Sodium Bicarbonate and Common Salt

The more comm...

Question

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}

is acidic and when moistened it reacts with

N a H C O_{3}

evolving

C O_{2}

gas.

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

slows down the decomposition reaction of

N a H C O_{3}

so that

C O_{2}

is evolved more slowly.

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

is acidic and when moisturized it reacts with

N a H C O_{3}

evolving

C O_{2}

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Both (a) and (b)

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Solution

The correct option is B Both (a) and (b)
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.
$N a A l (S O_{4})_{2}$ slows down the decomposition reaction of $N a H C O_{3}$ so that $C O_{2}$ is evolved more slowly.

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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.

In improved baking powder,

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

is used for :

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. Which gas is evolved when carboxylic acid reacts with weaker bases like

N a H C O_{3}

Q. 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:

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The more commonly used baking powder contains about 30% NaHCO3, 20% NaAl(SO4)2, 10% Ca(H2PO4)2 and 40% starch. Which of the following statements are correct?

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?