In the following reaction, which substance is acting as the Brønsted-Lowry acid?

NH3 + H2O NH4+ + OH

2 answers

Aha! Homework dumping, I see.

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Where is the arrow?
NH3 + HOH ==> NH4^+ + OH^-
Remember the Bronsted-Lowry theory says that the acid is the molecule that donates a proton. Which molecule on the left has one less H^+ on the right? The molecule on the left then is the acid. The other molecule is the base.