What is the conjugate base in the following equation: HBr + H2 O \longrightarrow ⟶ H3 O+ + Br-

would be the conjugate base in this reaction according to the Bronsted-Lowry acid-and-base theory.

Explanation:

Among the reactants, the Bronsted-Lowry acid is the species that supplies protons . The Bronsted-Lowry base would be the species that accept the protons.

On the product side of the equation, the BL-acid donates a proton to produce the conjugate base. The BL-base accepts a proton to produce the conjugate acid.

In this case, each molecule donates a proton to form one ion. Hence,

Each molecule would accept a proton to produce an ion. Hence,

the answer to your question is c.

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