Potassium nitrate is a soluble source of two major essential plant nutrients for high-value crops that benefit from nitrate nutrition and a source of potassium free of chloride. Appears as white crystalline salt, odorless, with a molecular weight of 101.1, easily soluble in water, pH between 5.5–8.0. Bulk density is 131.1 lb/ft³ (2.1 g/ml).