Q. In the titration of $Na_{2}CO_{3}\ and\ HCl$, the indicator used is
A) Methyl orange
B) Methylene blue
C) Phenolphthalein
D) Litmus
Explanation
(a)
pH of the solution at the equivalence point is on the acidic side due to dissolution of $CO_{2}$ formed. A slight excess of strong acid lowers pH to 3.5 when methyl orange produces red colour.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.