A) \[1.8\times {{10}^{-7}}\]
B) \[1.8\times {{10}^{-5}}\]
C) \[1.8\times {{10}^{-2}}\]
D) \[1.8\times {{10}^{-3}}\]
Correct Answer: B
Solution :
\[\because \,\,\,0.1\,\,\,M\]acetic acid and \[0.1\,\,M\] sodium acetate solution is an example of acidic buffer mixture, \[\therefore \] \[pH=p{{K}_{a}}+\log \frac{[salt]}{[acid]}\] \[\because \] \[[salt]=[acid]=0.1\,\,M\] \[\therefore \] \[pH=p{{K}_{a}}\] or \[[{{H}^{+}}]={{K}_{a}}\] (dissociation constant of acetic acid) \[=1.8\times {{10}^{-5}}M\]
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