Potassium Carbonate (K2CO3) is a white salt, soluble in water (insoluble in alcohol), which forms a strongly alkaline solution. It can be made as the product of potassium hydroxide's absorbent reaction with carbon dioxide. It is deliquescent, often appearing a damp or wet solid. Potassium Carbonate is used in the production of soap and glass.

Potassium Carbonate is being used as the electrolyte in many cold fusion experiments. It is sometimes used as a buffering agent in the production of mead or wine.

Aqueous Potassium Carbonate is used in the fertilizer industry for removal of carbon dioxide from the ammonia production synthesis gas coming from the steam reformer.

Aqueous Potassium Carbonate is also used as a fire suppressant in extinguishing deep fat fryers and various other B class related fires.

Potassium Carbonate is used in reactions to maintain anhydrous conditions without reacting with the reactants and product formed. It may also be used to pre-dry some ketones, alcohols, and amines prior to distillation.