Electric current is passed through a concentrated aqueous solution of sodium chloride by means of a battery. After disconnecting the circuit the solution thus obtained is divided into two equal parts by volume. In one part phenolphthalein and in one part methyl orange was added. What will be the colour of the solutions respectively?

Electric current is passed through a concentrated aqueous solution of sodium chloride by means of a battery. After disconnecting the circuit, the solution thus obtained is divided into two equal parts by volume. In one part, phenolphthalein and in one part, methyl orange was added. The colours of the solutions will be pink and yellow, respectively.
The indicator is any substance that gives a sign in the form of colour change in the presence or absence of chemical species. 

For example, when phenolphthalein is added to one part, it gives a pink colour because phenolphthalein is weakly acidic in nature. On the other hand, when methyl orange is added to one part, it gives a yellow colour due to its basic nature.