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Question

Chemistry Question on Acids and Bases

The pH value of N/10 NaOH is

A

7

B

10

C

12

D

13

Answer

13

Explanation

Solution

The correct option is(D): 13.

For NaOH,N/10NaOH=0.1M NaOHNaOH, N/10 NaOH = 0.1 M\, NaOH [NaOH]=0.1 M=10−1 M[NaOH]=0.1\,M=10^{-1}\,M [OH−]=[NaOH]=10−1 M[OH^{-}]=[NaOH]=10^{-1}\,M [H+][OH−]=10−14[H^{+}] [OH^{-}] = 10^{-14} ∴[H+]=10−14[OH−]=10−141×10−2=10−13\therefore \left[H^{+}\right]=\frac{10^{-14}}{\left[OH^{-}\right]}=\frac{10^{-14}}{1\times10^{-2}}=10^{-13} pH=−log[H+]=−(log 10−13)=13pH=-log\left[H^{+}\right]=-\left(log\,10^{-13}\right)=13