Q7 of 30 Page 34

"State The Chemical Property in Each Case On Which The Following Uses Of Baking Soda Are Based:-

(a) as an Antacid


(b) as a constituent of baking powder."

(a) Baking soda (sodium hydrogen carbonate) act as an antacid. Being alkaline, it neutralizes excess acid in the stomach and provides relief.


(b) For making baking powder, which is a mixture of baking soda and a mild edible acid such as tartaric acid. When baking powder is mixed in water, the following reaction takes place:


NaHCO3 + H+→ CO2 + H2O + sodium salt of any acid


Carbon dioxide produced in the reaction makes the bread or cake fluffy, soft and spongy.


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5

A compound 'X' is constituent of baking powder. It is used as an antacid. When 'X' is heated, it gives out a 'Y' which when passed through lime water turns it milky, and salt 'Z' is formed which is the main constituent of washing powder. Identify X Y and Z. Write balanced chemical equations for the reactions involved.

 6

Name one salt whose solution has pH more than 7 and salt whose solution has pH less than 7.

 8

"Name the products formed in each case when:

a. Hydrochloric acid reacts with caustic soda


b. Granulated zinc reacts with caustic soda


c. Carbon dioxide is passed into the lime water."

 9

Two solutions A and B have ph value 5 and 8 respectively. Which will be basic in nature?