1. Potassium dichromate is the inorganic compound with the formula K2Cr2O7. An orange solid, it is used in diverse laboratory and industrial applications. As with all hexavalent chromium compounds, it is chronically harmful to health. It is a crystalline ionic solid with a very bright, red-orange color. The salt is popular in laboratories because it is not deliquescent, in contrast to the more industrially relevant salt sodium dichromate. == Production == Potassium dichromate is usually prepared by the reaction of sodium dichromate and potassium chloride in the presence of an acid. Potassium dichromate precipitates, because it has a lower solubility than the corresponding sodium salt. Alternatively, it can be also obtained from potassium chromate by roasting chromite ore with potassium hydroxide: FeCr2O4 + 2 KOH + 1.5 O2 → K2Cr2O7 + Fe(OH)2 == Structure == The solid crystallizes as two polymorphs. These salts are soluble in water, and the dissolution process it ionizes, releasing... from wikipedia.org