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A Bronsted base is a substance that accepts a proton (H+). Here's an example:
NH3 + H2O ⇌ NH4+ + OH-
In this reaction, ammonia (NH3) acts as a Bronsted base by accepting a proton from water (H2O) to form ammonium ion (NH4+). Water, in this case, acts as a Bronsted acid, donating a proton.