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pH the Power of H

What is the w...

Question

What is the working pH range for phenopthalein?

8.0 - 9.8

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10.1 - 12.0

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6.4 - 8.0

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4.2 - 6.3

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Solution

The correct option is A $8.0 - 9.8$
Phenopthalein $p H$ range: $8.0 - 9.8$
$p H < 8$ is colourless and $p H > 10$ is pink

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F e {(O H)}_{3} = 1.0 \times 10^{- 36}

8 - 9.8

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