# Chapter 3 - Chemical Reactions - Questions for Review and Thought - General Questions - Page 148g: 107b

This is an acid-base reaction: Acid: $H_2CO_3 (H_2O + CO_2)$ Base: $NH_3$

#### Work Step by Step

** Notice, the carbon dioxide and water are capable of forming carbonic acid: $CO_2 + H_2O -- \gt H_2CO_3$ And, when we add a base, like ammonia, this happens: $NH_3 + H_2CO_3 -- \gt NH_4HCO_3$ ** The carbonic acid gave an $H^+$ to the ammonia, so, this is an acid-base reaction.

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