Question:
The equilibrium constant for the reaction below has the value Ka=3.5×10–4. In this reaction the Brønsted-Lowry acid is ________.
HF(aq) + H2O(l) ⇌ H3O+(aq) + F-(aq) Express your answer as a chemical formula.

Answer:
A Bronsted-Lowry acid is defined as anything that releases H+ ions. In this case a Fluorine acid dissociates to: HF=H+ + F-
At the same time H2O molecule accepts the H+ proton.
H2O+ H+= H3O+
So if the HF releases the H+, it is the Brønsted-Lowry acid in this reaction.


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