Prep. Made by dissolving one ounce of phosphate of soda, in crystals, in eight fluid ounces of distilled water, subsequently made up to ten fluid ounces.

Use. The solution is used under Magnesia, Carbonate and Sulphate of Magnesia, to test the presence of that base, by the formation of the ammonio-magnesian phosphate, as noticed under the solution of hydrochlorate of ammonia. Also under Carbonate of Lithia, the chloride of which is precipitated by the solution of phosphate of soda, as phosphate of lithia.