A) 7
B) 7.3010
C) 6.9
D) none of these
Correct Answer: D
Solution :
For \[5\times {{10}^{-8}}m\] \[HCl\] solution, \[[{{H}^{+}}]=(5\times {{10}^{-8}})+{{(10)}^{-7}}\] (from water) \[=15\times {{10}^{-8}}mol\text{-}ion\text{/}litre\] \[\therefore \] \[pH=-\log \,[{{H}^{+}}]\] \[=-\,\log 15\times {{10}^{-8}}\] \[=8-1.1760=6.824\]
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