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  4. At 25° C,pH range of phenolphthalein is 8-10. At 100° C, pH range of phenolphthalein would be

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Q. At $25^\circ C,pH$ range of phenolphthalein is $8-10.$ At $100^\circ C,$ $pH$ range of phenolphthalein would be

NTA AbhyasNTA Abhyas 2022

Solution:

The $pH$ range of the indicator is $pK_{I n}\pm1.$ On increase in temperature $pK_{I n}$ decreases therefore $pH$ range of indicator decreases.