Zinc Dihydrogen Phosphate is a colorless monoclinic crystal or white microcrystalline powder, with low refractive index and high transparency. Apparent density: 0.8 - 1 g/cm³. Soluble in inorganic acids, acetic acid, ammonia water, and ammonium salt solutions; insoluble in ethanol; almost insoluble in water, and its solubility decreases with rising temperature. Hygroscopic and corrosive.