Question

When will acids change color to methyl orange?

Answer 1

About indicator:

• An indicator changes colour when it is added to an acid or a base.
• An indicator defines whether a substance is acidic or basic by the change in its color.

Methyl orange:

• Methyl orange is a synthetic indicator and the neutral color of methyl orange is ‘orange’.
• The color of the methyl orange indicator turns yellow when it is added to a base or alkali (basic solution).
• The structure of methyl orange is given below:

Color change of methyl orange in acid and base:

• At ${25}^{\mathrm{o}}\mathrm{C}$, when the pH of the solution is below $4$ then, the color of the methyl orange indicator changes to red.
• At ${25}^{\mathrm{o}}\mathrm{C}$, when the pH of the solution is above $4$ then, the color of the methyl orange indicator changes to bright yellow.
• The color in the acidic solution is red while in the basic solution it is yellow.