Potassium carbonate, a white crystalline powder. Density 2.428g/cm3. Mp 89l ℃. Boiling decomposition. Soluble in water, aqueous solution is alkaline, insoluble in ethanol. Hygroscopic, exposed to the air can absorb carbon dioxide and water into potassium bicarbonate. Hydrates monohydrate, dihydrate, trihydrate. Its very hygroscopic, deliquescent in the air. Potassium carbonate aqueous solution is alkaline. Long-term storage can be gradually absorb carbon dioxide into solid potassium bicarbonate, K2CO3 insoluble in ethanol. White crystalline powder, soluble in water, very hygroscopic, caking, long-term exposure to air will absorb carbon dioxide into bicarbonate, potassium bicarbonate, should be sealed packaging.