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Question

Chemistry Question on Acids and Bases

The pH of 108MNaOH10^{-8}M\,NaOH is:

A

8

B

6

C

6.96

D

7.04

Answer

7.04

Explanation

Solution

For 108MNaOH10^{-8} M\, NaOH,
[OH]=108+107\left[ OH ^{-}\right] =10^{-8}+10^{-7} (from water)
=11×108=11 \times 10^{-8}
pOH=log[OH]=log11×108\therefore pOH =-\log \left[ OH ^{-}\right]=-\log 11 \times 10^{-8}
=81.04=6.96=8-1.04=6.96
pH=146.96=7.04pH =14-6.96=7.04