Final answer:
When heating potassium bicarbonate, it decomposes into potassium carbonate, carbon dioxide, and water.
Step-by-step explanation:
When heating potassium bicarbonate, a decomposition reaction occurs, leading to the formation of potassium carbonate, carbon dioxide, and water. The reaction is represented by the following balanced chemical equation:
2KHCO3 → K2CO3 + CO2 + H2O
So, potassium bicarbonate breaks down into potassium carbonate, carbon dioxide, and water when heated.