... soluble,we supply at big quantity and lower prices Phosphorous acid 99% is white crystal ,easily soluble,we supply at ... big quantity and lower pricesProduct Name Phosphorous acid CAS No:10294-56-1CAS NUMBER13598-36-2Chemical FormulaH3PO3Propertitieswhite ... the temperature is 180-200°C, it decompounds into ortho-phosphoric acid and phosphine. Soluble in water and lower alcohol easily, and ...