Production
Prussian blue is produced by oxidation of ferrous ferrocyanide salts. These white solids have the formula M2Fe where M+ = Na+ or K+. The iron in this material is all ferrous, hence the absence of deep color associated with the mixed valency. Oxidation of this white solid with hydrogen peroxide or sodium chlorate produces ferricyanide and affords Prussian Blue.
A "soluble" form of PB, K, which is really colloidal, can be made from potassium ferrocyanide and iron(III):
- K+ + Fe3+ + 4- → KFeIII
The similar reaction of potassium ferricyanide and iron(II) results in the same colloidal solution, because 3- is converted into ferrocyanide.
"Insoluble" Prussian blue is produced if in the reactions above an excess of Fe3+ or Fe2+, respectively, is added. In the first case:
- 4Fe3+ + 34- → FeIII3
Read more about this topic: Prussian Blue
Famous quotes containing the word production:
“Every production of an artist should be the expression of an adventure of his soul.”
—W. Somerset Maugham (1874–1965)
“... this dream that men shall cease to waste strength in competition and shall come to pool their powers of production is coming to pass all over the earth.”
—Jane Addams (1860–1935)
“The growing of food and the growing of children are both vital to the family’s survival.... Who would dare make the judgment that holding your youngest baby on your lap is less important than weeding a few more yards in the maize field? Yet this is the judgment our society makes constantly. Production of autos, canned soup, advertising copy is important. Housework—cleaning, feeding, and caring—is unimportant.”
—Debbie Taylor (20th century)