1
Question
The pH of 10−8 M HCl is:
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Solution
The correct option is C 6.96
HCl→H⨁+Cl⊖10−8M 10−8 MH2O⇌H⨁+OH⊖10−7 M
Since solution given is extremely diluted, the contribution of H2O is essential in pH calculation:
Now, [H⨁]TOTAL=10−7M+10−8M=1.1×10−7MpH=−log[H⨁]=−log[1.1×10−7]=7−log1.1
The final answer is only slightly less than 7.
HCl→H⨁+Cl⊖10−8M 10−8 MH2O⇌H⨁+OH⊖10−7 M
Since solution given is extremely diluted, the contribution of H2O is essential in pH calculation:
Now, [H⨁]TOTAL=10−7M+10−8M=1.1×10−7MpH=−log[H⨁]=−log[1.1×10−7]=7−log1.1
The final answer is only slightly less than 7.
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