Question

Baking soda is used in small amount for making bread and cake. It helps to make these soft and spongy. An aqueous solution of baking soda turns red litmus blue.
Use this information to answer the following questions:
(i) How does baking soda help to make cakes and bread soft and spongy?
(ii) Is the pH value of baking soda solution lesser than or greater than seven?

Answer 1

1:- generally , when baking soda heated then it produces carbon dioxide.the bubbles comes from co2 trapped which causes to rise which makes the cakes and bread soft and spongy.the acid is also add to neutrilise the sodium carbonate which causes a bitter taste

2:-the ph of baking soda is grater than 7.it nearly about 9

Answer 2

1) Baking soda help to make cake and bread soft and spongy by the evolution of CO2 gas on heating.
2NaHCO3--Na2CO3+CO2+H2O
The Na2CO3 which is washing soda is neutralised by a weak acid like tartaric acid otherwise cakes will have a bitter taste
2) Since NaHCO3 turns red litmus to blue,therfore it's a base and has a pH value greater than 7.
HOPE IT HELPS