Question

Why methyl orange change colour titration of hcl with na2co3?

Answer 1

Explanation:

Methyl orange shows pink colour in acidic medium and yellow colour in basic medium. Because it changes colour at the pH of a mid strength acid, it is usually used in titration for acids.

Answer 2

This is so because the last drop of added alkali brings the pH of the solution in the range in which phenolphthalein shows sharp colour change. In the titration of strong acid and a weak base, methyl orange is chosen as indicator.