State differences between acids and bases.

NCERT Science

Book: NCERT Science

Chapter: 5. Acids, Bases and Salts

Subject: Chemistry - Class 7^th

Q. No. 1 of Exercise

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1

State differences between acids and bases.

Differences between acids and bases are as follows:

Acids	Bases
Acids turn blue litmus to red.	Bases turn red litmus to blue.
Acids are sour in taste.	Bases are bitter in taste.
Chemical nature of such substances is acidic.	The nature bases of such substances is said to be basic.
They are not soapy to touch.	They are soapy to touch.
Example: Hydrochloric acid, acetic acid.	Example: Soaps at our homes, Sodium Hydroxide.

5

1

State differences between acids and bases.

2

Ammonia is found in many house-hold products, such as window cleaners. It turns red litmus blue. What is its nature?

3

Name the source from which litmus solution is obtained. What is the use of this solution?

4

Is the distilled water acidic/basic/neutral? How would you verify it?

5

Describe the process of neutralization with the help of an example.

6

Mark “T” if the statement is true and “F” if it is false:
i. Nitric acid turns red litmus blue. (T/F)

ii. Sodium hydroxide turns blue litmus red. (T/F)

iii. Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. (T/F)

iv. Indicator is a stub stance which shows different colours in acidic and basic solutions. (T/F)

v. Tooth decay is caused by the presence of a base. (T/F)

7

Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labeled. He has to serve the drinks on the demand of customers. One customer wants acidic drink; another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?

8

Explain why:
a. An antacid tablet is taken when you suffer from acidity.

b. Calamine solution is applied on the skin when an ant bites.

c. Factory waste is neutralized before disposing it into the water bodies.

9

Three liquids are given to you. One is hydrochloric acid; another is sodium hydroxide and third is a sugar solution. How will you identity them? You have only turmeric indicator.

10

Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.

11

Consider the following statements:
a. Both acids and bases change colour of all indicators.

b. If an indicator gives a colour change with an acid, it does not give a change with a base.

c. If an indicator changes colour with a base, it does not change colour with an acid.

d. Change of colour in an acid and a base depends on the type of the indicator.

Which of these statements are correct?

i. All four ii. a and b

iii. b and c iv. Only d