Question
Question: At 25ŗC pH range of phenolphthalein is 8 – 10. At 100ŗC pH range of phenolphthalein would be-...
At 25ŗC pH range of phenolphthalein is 8 – 10. At 100ŗC pH range of phenolphthalein would be-
A
pH range remain unaffected by the temperature
B
pH range is altered to 8 to 9
C
pH range is altered to 7 to 11
D
pH range is altered to 8 to 11
Answer
pH range is altered to 8 to 9
Explanation
Solution
The pH range of the indicator is pKin ± 1. On increase in temperature pKin decreases therefore pH range of indicator decreases.