CBSE Class 10 Answered

Methyl orange is a pH indicator frequently used in titrations.

It is often chosen to be used in titrations because of its clear colour change. Because it changes colour at the pH of a mid-strength acid, it is usually used in titrations for acids. Unlike a universal indicator, methyl orange does not have a full spectrum of colour change, but has a sharper end point

In a solution becoming less acidic, methyl orange moves from red to orange and finally to yellow with the reverse occurring for a solution increasing in acidity. It should be noted that the entire colour change occurs in acidic conditions.

In an acid it is reddish and in alkali it is yellow

4-dimethylaminoazobenzene-4'-sulfonic acid sodium salt is its IUPAC name

C₁₄H₁₄N₃NaO₃S is the mol.for.