A) 8
B) 10
C) 6.96
D) 12
Correct Answer: C
Solution :
If the concentration of acid is less than\[{{10}^{-7}},\]then the concentration of H4 present in water is not neglected. Total\[[{{H}^{+}}]=[{{H}^{+}}]\]from\[HCl+[{{H}^{+}}]\]from\[{{H}_{2}}O\] \[={{10}^{-8}}+{{10}^{-7}}\] \[={{10}^{-7}}(1.1)\] \[=1.1\times {{10}^{-7}}mol/L\] \[pH=-\log [{{H}^{+}}]\] \[=-\log (1.1\times {{10}^{-7}})\] \[=6.96\]
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