Potassium carbonate is a potassium salt that is the dipotassium salt of carbonic acid. It has a role as a catalyst. It is a carbonate salt and a potassium salt. Potassium carbonate appears as a white Powder or as colorless solid crystal and has a salty taste. Known as potash or pearl ash, it used in pharmaceutical laboratories as a drying agent or as a source of potassium. It used in fire extinguishers, to make soap, to make glass, and to soften water. It is found in effervescent tablets. Potassium carbonate is a product made by a reaction between liquid caustic potash and carbon dioxide, followed by filtration and then drying.