What happens when?

a) A solution of calcium hydroxide is added to red litmus paper

b) A solution of sodium chloride is added to red litmus paper

c) A solution of lemon juice is added to blue litmus paper

d) A solution of distilled water is added to red litmus paper

e) A solution of sodium hydroxide is added to turmeric [5 MARKS]

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Solution

Each point: 1 Mark

Bases turn red litmus blue, while acids turn blue litmus red

a) Since calcium hydroxide is a base, the red litmus will turn blue.

b) No color change will take place as sodium chloride is a neutral salt

c) Since lemon juice contains citric acid it will turn blue litmus into red.

d) No color change will take place as distilled water is neutral by nature.

e) Turmeric powder is yellow in color and it turns pink when treated with a basic solution. Hence here the turmeric will turn pink as sodium hydroxide is a base.

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Question 3:

What happens to Red litmus paper when added to acid and base solution?

What would you observe when :

(a) blue litmus is introduced into a solution of hydrogen chloride gas,

(b) red litmus paper is introduced into a solution of ammonia in water,

A student prepared 20% sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below:

(I) Sodium hydroxide solution turns red litmus blue
(II) Sodium hydroxide readily dissolves in water
(III) The beaker containing solution appears cold when touched from outside
(IV) The blue litmus paper turns red when dipped into the solution

The correct observations are :

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(1) sodium hydroxide solution
(2) sodium carbonate solution
(3) blue litmus solution
(4) zinc metal

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