... % Aqueous Solution TestColorless transparentColorless transparent, without impuritiesLiquid Phosphorous Acid (%) ≥ 70-80Colorless, transparentPropertiesPhosphorous acid is a colorless crystal. It can be slowly oxidized ... °C (Decomposes)Solubility: Easily soluble in water and alcohol.ApplicationsPhosphorous acid is mainly used in the production of phosphates, synthetic fibers ...