The blue is nitrogen, white is hydrogen and the red is oxygen. Ammonia is the Bronsted Lowry base and water is acting as an acid in the given reaction. A Bronsted Lowry base is a substance that can receive a proton also called proton acceptors. The ammonia is receiving a proton from the water. The water is the proton donor. A Bronsted Lowry acid is a substance that can give a proton to another substance.