# Which of the following are Bronsted-Lowry acids? a. HSO_3^(-), b. HF, c. SO_3^(2-), d. SO_4^(2-), e. Cl_2?

May 24, 2016

$\text{(a) and (b)}$

#### Explanation:

Bronsted-Lowry acids are proton donors, for bisulfite, $H S {O}_{3}^{-}$:

$H S {O}_{3}^{-} + {H}_{2} O r i g h t \le f t h a r p \infty n s {H}_{3} {O}^{+} + S {O}_{3}^{2 -}$

Of course, this equilibrium lies to the left, as it does for weakly acidic hydrogen fluoride.

On the other hand, $C {l}_{2}$, can donate no protons to the solvent, and is not classified as an acid.