Question

Conjugate base for Bronsted acids $H_{2}O$ and $HF$ are:

• A. $O{H}^{-}$ and $F^{-}$, respectively
• B. $H_3{O}^{+}$ and $H_2{F}^{+}$, respectively
• C. $O{H}^{-}$ and $H_2{F}^{+}$, respectively
• D. $H_3{O}^{+}$ and $F^{-}$ respectively

Answer 1

Answer: (A)

HF on loss of $H^{\oplus }$ ion becomes $F^{\ominus }$ is the conjugate base of HF
Example :
$\underset{\text{ Acid}}{\mathrm{HF}}+\underset{\text{ Base}}{H_{2}O}\rightleftharpoons \underset{\text{ Conjugate base }}{F^{\ominus }}+\underset{\text{ Conjugate acid}}{H_3{O}^{\oplus }}$