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Question

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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 lesser than or greater than 7? (CBSE Sample Paper)

Solution

(i) On heating sodium bicarbonate, the main constituent of baking soda, decomposes to produce CO₂. This causes cakes and bread to become light, soft and spongy.

2NaHCO₃ +heat → Na₂CO₃ +H₂O +CO₂

(ii) Baking soda on reaction with sulphuric acid gives CO₂ vigorously. CO₂ helps to extinguish fire.

2NaHCO₃ + H₂SO₄→ Na₂SO₄ + 2H₂O + 2CO₂

(iii) The pH of baking soda solution should be greater than 7.

Some More Questions From Control and Coordination Chapter

Choose the olfactory indicators and give their characteristics: red cabbage extract, onion, vanilla extract, litmus, clove oil.

What do you understand by concentrated and dilute acids?

How do metals react with bases?

What is a neutralization reaction? Give some examples.

What are non-metallic oxides? Substantiate your answer.

Take 5 ml hydrochloric acid in a boiling tube or a conical flask. Add a few pieces of zinc granules to it.

(a) What do you observe on the surface of zinc granules?
(b) Name the gas evolved.
(c) What happens when the above gas is passed through soap solution?
(d) What happens when a burning candle is brought near the gas filled tube?

Name four acids and bases. Write their formulae.

Name the various kind of oxides and mention their properties.

What are acids? How are they produced?

Mention important characteristics of acids.

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