Lakhmir Singh Solutions Class 10 Chemistry Solutions for Exercise in Chapter 2 - Chapter 2 Acids, Bases and Salts

Question 97 Exercise

A group of students measured the pH of some substances they found in their homes. Their results are given in the following table:

Substance pH
Apples 3.0
Baking soda 8.5
Black coffee 5.0
Household ammonia 12.0
Lemon juice 2.5
Milk 6.5
Salt 7.0
Sugar 7.0
Toothpaste 9.0
Vinegar 3.0
Washing Soda 11.5

(a) What would the students have used to measure the pH ?

(b) Which solution is the most acidic?

(c) Which solution is the most alkaline?

(d) Which solutions are neutral?

(e) Which solution can be used to treat wasp stings?

(f) Which solution can be used to treat bee stings?


(a) To measure the pH, the universal indicator is used which is having different colours identifying pH from 0 to 14.

(b) Lemon juice has a pH of 2.5 and it is the most acidic which is less than 7

(c) Household ammonia with pH  12 is the most alkaline as the value is more than 7.

(d) Salt solution and sugar solution are neutral and have pH 7.

(e) To treat wasp stings vinegar the weak acid, can be used as the wasp sting injects alkaline liquid into the skin.

(f) Baking soda is a base that can be used to neutralize the acid which is caused due to the bee sting. It injects methanoic acid into the skin.

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