(C) By definition,the $pK_a$ value is the negative logarithm of the acid dissociation constant $(K_a)$.Mathematically,$pK_a = -\log_{10} K_a$.Since $-

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

(C) By definition,the $pK_a$ value is the negative logarithm of the acid dissociation constant $(K_a)$.Mathematically,$pK_a = -\log_{10} K_a$.Since $-\log_{10} K_a = \log_{10} (K_a)^{-1} = \log_{10} \frac{1}{K_a}$,the correct expression is $\log_{10} \frac{1}{K_a}$.