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Q.

At 298 K, pH of 10-8 M HCl solution is nearly

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a

8

b

6.956

c

6.301

d

6

answer is C.

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Detailed Solution

[H+] of HCl is 10-8 M.

This is less than [H+] of H2O ( 10-7 M ).

Thus [H+] of H2O cannot be neglected.

Overall [H+] = [H+]HCl + [H+]water

Overall [H+] = 10-8 M + 10-7 M

Overall [H+] = 1.1 ×10-7 M

               pH = 6.956 ;

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At 298 K, pH of 10-8 M HCl solution is nearly