A) 5
B) 7
C) 9
D) 2
Correct Answer: B
Solution :
As \[MA\] is a salt of weak acid \[(HA)\] and weak base\[(MOH)\], \[\therefore \] \[pH=7+\frac{1}{2}\times [p{{K}_{a}}-p{{K}_{b}}]\] ... (i) \[\because \] \[p{{K}_{a}}=-\log {{K}_{a}}\] \[=-\log {{10}^{-6}}=6\] Similarly\[p{{K}_{b}}=-\log {{K}_{b}}\] \[=-\log {{10}^{-6}}=6\] By putting these values in equation (i) \[pH=7+\frac{1}{2}\times (6-6)\] or \[pH=7\]
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