What happens when [5 MARKS]

a) A red litmus paper is dipped in a solution of calcium hydroxide.

b) A red litmus paper is dipped in a solution of sodium chloride.

c) A blue litmus paper is dipped in lemon juice.

d) A red litmus paper is dipped in distilled water.

e) A solution of sodium hydroxide is added to turmeric.

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Solution

Each part: 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, the blue litmus paper will become 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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Similar questions

When a red litmus paper is dipped in the aqueous solution of $X$ there is no change in colour.
When a blue litmus paper is dipped in the same solution it turns red.
Which among the following options can be the chemical $X$ ?

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 :

A student prepared $20 %$ sodium hydroxide solution in a beaker containing water. The observations noted by him are given below

(I) Sodium hydroxide is in the form of pellets.

(II) It dissolves in water readily.

(III) The beaker appears cold when touched from outside.

(iv) The red litmus paper turns blue when dipped into the solution

When blue litmus paper is dipped into the water, the colour of litmus paper remains same. Similarly, when a red litmus paper is dipped into the water, the colour remains same. By the above observation, we can conclude that:

If blue litmus paper is dipped in vinegar solution, the color of litmus paper will change to:

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