A) \[-7\]
B) \[7\]
C) \[12\]
D) \[-12\]
Correct Answer: B
Solution :
We know that \[{{10}^{-12}}M\] solution of \[HCl\] is very dilute. So concentration of \[H\] ions due to self-ionisation of water cannot be neglected. Therefore,\[{{[{{H}^{+}}]}_{total}}={{H}^{+}}[from\,\,HCl+water]\]\[-\log [1.00001\times {{10}^{-7}}]=7.\] We also know that\[pH=-\log [{{H}^{+}}]\] \[=-\log [1.00001\times {{10}^{-7}}]=7\]
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