What will you observe when :
(i) Red litmus is introduced into a solution of sodium sulphate.
(ii) Methyl orange is added to dil HCl.
(iii) Blue litmus is introduced into a solution of ferric chloride.
Observations:
(i) It will undergo no colour change because solution of Na2SO4 in water is almost neutral.
(ii) In the acidic solution, the colour of methyl orange will change to reddish.
(iii) FeCl3 solution on reacting with water will form ferric hydroxide and hydrochloric acid. Since, the acid is strong, the solution will be acidic. Therefore, the colour of blue litmus will change to red.