A) \[8.2798\]
B) \[10.6990\]
C) \[12.7854\]
D) \[13.3344\]
Correct Answer: B
Solution :
Key Idea: We know that \[pH+pOH=14\] First of all we calculate the pH value. \[[{{H}^{+}}]=0.0005\,M=5\times {{10}^{-4}}M\] \[pH=-\log [5\times {{10}^{-4}}]\] \[=-[\log \,5+4\log {{10}^{-4}}]\] \[=-\log 5+4\log 10\] \[=3.3010\] \[pH+pOH=14\] \[3.3010+pOH=14\] \[pOH=14-3.3010\] \[=10.6990\]
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