Question

$0.1N$ solution of sodium carbonate is titrated with $0.1N$ solution of sulphuric acid. The best indicator to be used for this titration is:

• A. phenolphthalein
• B. methyl orange
• C. litmus
• D. starch solution

Answer 1

Answer: (B)

methyl orange

$0.1N$ solution of sodium carbonate is titrated with $0.1N$ solution of sulphuric acid. The best indicator to be used for this titration is methyl orange.

Methyl orange indicator has $pH$ range of $3.0$ to $4.4$. It is used for the titration of strong acid against a strong or weak base.

In acid solution, methyl orange gives red colour and in basic solution, it gives yellow colour.

Option B is correct.