Question

Baking soda is used in small amount in making bread and cake. It helps to make these soft and

spongy. An aqueous solution of baking soda turns red litmus blue.

It is also used in soda acid fire extinguisher.

Use this information to answer the following questions:-

(i) How does Baking Soda help to make cakes and bread soft and spongy?

(ii) How does it help in extinguishing fire?

(iii) Is the pH value of baking soda solution lower than or higher than 7 ?

Answer 1

(i) On heating, baking soda gives out CO2

which makes cakes and bread rise up, so they be-

come soft and spongy. 1

(ii) CO2

being heavier than air settles down and forms a layer between the burning substance

and the air, thus cutting off the supply of oxygen. 1

(iii) Its pH value is greater than 7.

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Answer 2

(i) This is so because carbon dioxide gas is released when baking soda is heated . This co2 is the reason for cakes being sponzy

(ii) Again it containa co2 which is not a supporter of combustion and extinguishes it.

(iii) It's pH is higher than that of 7.