Classify each of the compounds as Soluble (s) or Not Soluble (ns) : Solution I am considering solubility in water. Barium carbonate is a white powder. It is insoluble in water and soluble in most acids. Not Soluble (ns) in water. Potassium Acetate is hygroscopic and soluble in water, alcohol, methanol, and ammonia. Soluble (s) in water. Sodium sulfide is a colorless hygroscopic solid. It is a water soluble salts. Soluble (s) in water. .