Question

Identify the correct statement(s) for the given reaction.

$HCl+H_{2}O\to H_3{O}^{+}+C{l}^{-}$

a) Conjugate base of $HCl$ is $C{l}^{-}$

b) Conjugate acid-base pair is $H_3{O}^{+}$ and $H_{2}O$

c) Conjugate base of $H_{2}O$ is $H_3{O}^{+}$

d) Conjugate acid-base pair is $HCl$ and $H_3{O}^{+}$

• A. a and b are correct
• B. a and c are correct
• C. c and d are correct
  
• D. a and d are correct

Answer 1

The correct option is A a and b are correct

Conjugate acid-base pair differs by one $H^{+}$ ion.

$HCl+H_{2}O\to H_3{O}^{+}+C{l}^{-}$

Acid Base Conj. acid Conj. base

In the above reaction:

$HCl$ is acting as an acid and its conjugate base is $C{l}^{-}$.

$H_{2}O$ is acting as a base and its conjugate acid is $H_3{O}^{+}$.

So, option A is correct.