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Ammonium dihydrogen phosphate (ADP), also known as monoammonium phosphate (MAP), NH4H2PO4, is formed when a solution of phosphoric acid is added to ammonia until the solution is distinctly acidic. It crystallizes in tetragonal prisms.
A 2124 (OTTO) Ammonium dihydrogenphosphate, 99.999% Cas 7722-76-1 - used in solid phase column chromatography.