When sulfamic acid (HSO3NH2) and calcium carbonate (CaCO3) react, they undergo a chemical reaction to form calcium sulfamate, water, and carbon dioxide gas. The balanced chemical equation for this reaction is:

2HSO3NH2 + CaCO3 → Ca(SO3NH2)2 + H2O + CO2

In this reaction, the sulfamic acid acts as an acid, donating hydrogen ions (H+), while the calcium carbonate acts as a base, accepting hydrogen ions (H+). The reaction results in the formation of calcium sulfamate, which is a salt, water (H2O), and carbon dioxide gas (CO2).