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At 25^(@)C pH range of phenolphthalein i...

At `25^(@)C pH` range of phenolphthalein is `8-10`. At `100^(@)C pH` range of phenophthalein would be

A

pH range remains 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

Text Solution

Verified by Experts

The correct Answer is:
B
The `pH` range of the indicator is `pK_("in")+1`. On increase in temperature, `pK_("in")` decreases therefore `pH` range of indicator decreases.
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