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Question: 10-2 mole of NaOH was added to 10 litre of water. The pH will change by...

10-2 mole of NaOH was added to 10 litre of water. The pH will change by

A

4

B

3

C

11

D

7

Answer

4

Explanation

Solution

Old pH = 7

New [OH-] =10−2×110=10−310^{- 2} \times \frac{1}{10} = 10^{- 3}

New pH = 11

Change in pH = 4