Question

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]

Answer 1

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.