Potassium chloride is a main compound utilized in composition of potassium supplements as well as agricultural fertilizer. The supplements are recommended to people who have low levels of potassium in their blood and are at risk of heart and other problems. This chemical compound is available in six grades. It can be identified by its odorless, white crystalline powder that easily dissolves in water, but is insoluble in other solutions, like ethanol. The taste of potassium chloride is strong saline.