Consider the following Brønsted - Lowry equilibrium system:
$$
\mathrm{HSO}_{3}^{-}+\mathrm{H}_{2} \mathrm{PO}_{4}^{-} \rightleftharpoons \mathrm{SO}_{3}^{2-}+\mathrm{H}_{3} \mathrm{PO}_{4}
$$

What are the two Brønsted - Lowry bases in the equilibrium above?
$$
\begin{array}{l}
\mathrm{H}_{2} \mathrm{PO}_{4}^{-} \text {and } \mathrm{SO}_{3}^{2-} \
\mathrm{HSO}_{3}^{-} \text {and } \mathrm{H}_{3} \mathrm{PO}_{4} \
\mathrm{H}_{2} \mathrm{PO}_{4}^{-} \text {and } \mathrm{H}_{3} \mathrm{PO}_{4} \
\mathrm{HSO}_{3}^{-} \text {and } \mathrm{SO}_{3}^{2-}
\end{array}
$$

Question

Consider the following Brønsted - Lowry equilibrium system:
$$
\mathrm{HSO}_{3}^{-}+\mathrm{H}_{2} \mathrm{PO}_{4}^{-} \rightleftharpoons \mathrm{SO}_{3}^{2-}+\mathrm{H}_{3} \mathrm{PO}_{4}
$$

What are the two Brønsted - Lowry bases in the equilibrium above?
$$
\begin{array}{l}
\mathrm{H}_{2} \mathrm{PO}_{4}^{-} \text {and } \mathrm{SO}_{3}^{2-} \
\mathrm{HSO}_{3}^{-} \text {and } \mathrm{H}_{3} \mathrm{PO}_{4} \
\mathrm{H}_{2} \mathrm{PO}_{4}^{-} \text {and } \mathrm{H}_{3} \mathrm{PO}_{4} \
\mathrm{HSO}_{3}^{-} \text {and } \mathrm{SO}_{3}^{2-}
\end{array}
$$

Accepted Answer

***B*** ∻Key Concept∻ ⚹Brønsted-Lowry acid-base theory⚹ ∻Explanation∻ ⚹In the Brønsted-Lowry acid-base theory, an acid is a proton (H⁺) donor, and a base is a proton acceptor. In the given equilibrium, $\mathrm{HSO}_{3}^{-}$ acts as an acid by donating a proton to become $\mathrm{SO}_{3}^{2-}$, and $\mathrm{H}_{3}\mathrm{PO}_{4}$ acts as an acid by donating a proton to become $\mathrm{H}_{2}\mathrm{PO}_{4}^{-}$. Therefore, the corresponding bases that accept the protons are $\mathrm{SO}_{3}^{2-}$ and $\mathrm{H}_{2}\mathrm{PO}_{4}^{-}$. However, since the question asks for the bases in the equilibrium, the correct answer is the species that are acting as bases, which are $\mathrm{HSO}_{3}^{-}$ as it can accept a proton to revert to its acid form, and $\mathrm{H}_{3}\mathrm{PO}_{4}$ as it can donate a proton to revert to its conjugate base form, $\mathrm{H}_{2}\mathrm{PO}_{4}^{-}$.⚹◊What is the definition of a Brønsted-Lowry base in a chemical equilibrium system?⍭ Generate me a similar question◊

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