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Chemistry Question on Acids and Bases

The pHpH of 10−8 M HCl10^{-8}\, M \,HCl solution is

A

8

B

more than 8

C

between 6 and 7

D

slightly more than 7

Answer

between 6 and 7

Explanation

Solution

From H2O,[H2]=1×10−7 M{H_2O, [H^2] = 1\times 10^{-7} \,M }

From HCI,[H+]=1×10−8 MHCI, [H^+] = 1 \times 10 ^{-8}\, M

Total {[H^+] = (1 \times 10^{-7} + 1 \times 10^{-8}}) }M

=(1×10−7+0.1×10−7)= (1 \times 10^{-7} + 0.1 \times 10^{-7} ) M

=1.1×10−7= 1.1 \times 10^{-7} M

pH=−log(1.1×10−7)pH = - log (1.1 \times 10^{-7} ) = 6.9586