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Potassium bicarbonate (KHCO3) decomposes in the presence of heat (above 100 degrees C) into potassium carbonate (K2HCO3), water (H2O), and carbon dioxide (CO2). The reaction is given as 2 KHCO3 –> K2CO3 + H2O + CO2. Continued heating can further decompose the potassium carbonate into potassium oxide.
