What substance is acting as the brønsted-lowry acid in the forward reaction below? h2o + nh3 yields nh4+ + oh- nh3 h2o nh4+ oh-

Hello!

The substance that is acting as the Brønsted-Lowry Acid is H₂O

This is the chemical reaction:

H₂O + NH₃ → NH₄⁺ + OH⁻

In the Brønsted-Lowry Acid Concept, an Acid is a substance which donates a proton, and a Base is a substance which accepts protons. To know which compounds are acids and which are bases in this theory, we need to look at the proton movements. H₂O (The Acid) is donating a proton to NH₃ (The base), to produce NH₄⁺ (An acid) and OH⁻ (A base). Water is not commonly seen as an acid, but in this reaction, it is a Brønsted-Lowry Acid. 

Have a nice day!

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The mass has escaped into a gas which you can not see so the law stays true.