Question

At $25^{o} C$ pH range of phenolphthalein is 8 - 10. At $100^{o} C$ pH range of phenolphthalein would be

Moderate

Solution

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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