... Colorless crystals or white,crystalline powder, soluble in water, insoluble in alcohol and acetone, aqueous solution ... , crystalline powder with a slight odour of ammonia that can dissolve in water to give a ... , carbon dioxide and water vapor in an endothermic process (as it is with many ammonium salts) ... drop in the temperature of the water. When reacted with acids, carbon dioxide is produced, while ...