Question

The best indicator for the detection ofthe end point in the titration of a weak acid and a strong base is

• A. Methyl orange (pH range 3 to 4)
• B. Methyl red (pH range 4 to 6)
• C. Thymol blue (pH range 8 to 3)
• D. Phenolphthalein (pH range 8 to 10)

Answer 1

Answer: (D)

Phenolphthalein (pH range 8 to 10)

From the titration curve, it can be seen that,

$Phenolphthalein$ (pH range 8 to 10) is the best indicator for the detection of the endpoint in the titration of a weak acid and a strong base.