A) 5.0
B) 6.0
C) 7.0
D) 9.0
Correct Answer: C
Solution :
[c] \[p{{K}_{a}}=-\log {{K}_{a}}p{{K}_{a,}}p{{K}_{b}}=-\log {{K}_{b}}\] \[pH=-\frac{1}{2}[log{{K}_{a}}+log{{K}_{w}}-log{{K}_{b}}]\] \[=-\frac{1}{2}[-5+log(1\times {{10}^{-14}})-(-5)]\] \[=-\frac{1}{2}[-5-14+5]=-\frac{1}{2}(-14)=7\]You need to login to perform this action.
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