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(NH4)2HPO4 crystallizes in the space group P21/c with cell constants a = 11"043 (6), b = 6.700 (3), c = 8.031 (4)/~, fl = 113"42 (3) ° and Z= 4, and is isomorphous with (NHa)2HAsO4. The structure is refined using three-dimensional data collected on a four-circle automatic diffractometer. The final R value is 0.015 for 649 observed reflections. The positions of the hydrogen atoms indicate that only four among five N. • • O contact distances (less than 3.2/~ from each NH4 + ion) represent the actual N-H... O bonds. The length of the O-H..-O bond is 2.615 (1) A and differs significantly from 2.669 (13)/~ found in the isomorphous arsenate. It is suggested that this is a consequence of the size difference between the ps+ and As 5+ ions.

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