Ammonium Molybdate Tetrahydrate (NH4)6Mo7O24.4H2O, AR 500g Applications as an analytical reagent to measure the amount of phosphates, silicates, arsenates and lead in aqueous solution (e.g. pigments, river water, sea water etc.)[4] in the production of molybdenum metal and ceramics in the preparation of dehydrogenation and desulfurization catalysts in the fixing of metals in electroplating in fertilizers for crops. Appearance white solid Density 2.498 g/cm3 Melting point ~90 ˚C (loses water molecule) 190 °C (decomp.) Solubility in water 65.3 g / 100ml (tetrahydrate)