Ionic Equilibrium Question 10
Question 10 - 31 January - Shift 2
Incorrect statement for the use of indicators in acid-base titration is :
(1) Methyl orange may be used for a weak acid vs weak base titration.
(2) Methyl orange is a suitable indicator for a strong acid vs weak base titration
(3) Phenolphthalein is a suitable indicator for a weak acid vs strong base titration
(4) Phenolphthalein may be used for a strong acid vs strong base titration.
Show Answer
Answer: (1)
Solution:
Formula: indicators in acid base titration
| Indicator | $pH$ range |
|---|---|
| Methyl orange | $3.2-4.5$ |
| Phenolpthalein | $8.3-10.5$ |
Methyl orange may be used for a strong acid vs strong base and strong acid vs weak base titration. Phenolpthalein may be used for a strong acid vs strong base and weak acid vs strong base titration.
