Ammonium Molybdate is a colourless solid, sometimes known as ammonium paramolybdate or simply as ammonium molybdate, however the term ammonium molybdate can also refer to ammonium orthomolybdate, (NH 4) 2 MoO 4, and a number of other substances. One of the more typical molybdenum compounds is this one. This usually dissolves in water.