Question

Nature of methyl orange is:
A) Acidic
B) Basic
C) Neutral
D) None of these

Answer 1

Hint: In this question we have to tell about the nature of methyl orange whether it is natural, acidic or basic. On the basis of pH we can tell about the nature of methyl orange.

Complete answer:
> We know that Methyl orange is a pH indicator frequently used in titration because of its clear and distinct color variance at different pH values.
> Methyl orange shows red color in acidic medium and yellow color in basic medium. Because it changes color at the pKa of a mid strength acid, it is usually used in titration for acids.
> Methyl Orange is a weak acid which dissociates in water forming orange neutral molecules. Under acidic conditions, the equilibrium is to the left, and the concentration of the neutral molecules is too low for the orange colour to be observed.
> It is red in pH under 3.1, yellow in pH over 4.4, and orange in between, with a pKa of 5.1. From the above explanation we can say that Methyl Orange is a weak acid which dissociates in water forming orange neutral molecules. Below given is the diagram of methyl orange:

So, from the above explanation we can say that the nature of methyl orange is acidic. The correct answer is “A”.

Note: Murexide and methyl red are investigated as promising enhancers of sonochemical destruction of chlorinated hydrocarbon pollutants. The yellow form is the co-base of the red form.