Equilibrium Question 740
Question: Four species are listed below:
(i) $ HC{O^{-}}_3 $
(ii) $ H_3{O^{+}} $
(iii) $ HS{O^{-}}_4 $
(iv) $ HSO_3F $
Which one of the following is the correct sequence of their acid strength-
Options:
A) iv <ii <iii <i
B) ii <iii <i <iv
C) i <iii <ii <iv
D) iii <i <iv <ii
Show Answer
Answer:
Correct Answer: C
Solution:
The $ pK_{a} $ values of $ HCO_3^{-} $ and $ HSO_4^{-} $ are 10.25,-1.74 and 1.92 respectively and $ HSO_3 $ F is super acid. $ (iv)>(ii)> $ (iii)>(i)
