Question

During the titration of mixture of $NaOH,{Na}_2{CO}_3$ and an inert substance against hydrochloric acid:

• A. Phenolphthalein is used to detect the end point when $NaOH$ is completely neutralized and half of ${Na}_2{CO}_3$ is neutralized
• B. Methyl orange is used to detect the final end point
• C. Methyl orange is used to detect the first end point
• D. Phenolphthalein is used to detect the final end point

Answer 1

Answer: (A), (B)

Phenolphthalein is used to detect the end point when $NaOH$ is completely neutralized and half of ${Na}_2{CO}_3$ is neutralized
Methyl orange is used to detect the final end point

During the titration of mixture of $NaOH,{Na}_2{CO}_3$ and an inert substance against hydrochloric acid Phenolphthalein is used to detect the end point when $NaOH$ is completely neutralized and half of ${Na}_2{CO}_3$ is neutralized,but Methyl orange is used to detect the final end point.

Hence option A,B are correct.