Iron oxalate

Ferrous oxalate

• 516-03-0
• 6047-25-2 (dihydrate )
• 166897-40-1 (hexahydrate )

Yellow powder

Fixed

2.28 g · cm -3 ( dihydrate)

190 ° C (dihydrate, decomposition)

• Poorly in water
• Soluble in inorganic acids

Attention

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Iron (II ) oxalate is an iron salt of oxalic acid.

Occurrence

Of course, iron (II ) oxalate dihydrate occurs as a mineral Humboldtin before (after Friedrich Heinrich Alexander von Humboldt ).

Production and representation

Can be prepared with oxalic acid or Alkalioxalaten iron (II ) oxalate through reaction of aqueous iron (II ) salt solutions.

Properties

Iron (II ) oxalate forms pale yellow rhombic crystals. The dihydrate comes in two different (monoclinic and orthorhombic ) before crystal forms.

Iron is heated to about 190 ° C. (II ) oxalate, one obtains the so-called wustite phase, a black iron oxide product which has a more or less large iron deficiency with respect to the formula FeO. Next, the equation of this reaction:

Under certain conditions, this reaction also stoichiometric iron (II ) oxide are shown (see here).

Use

Use is iron (II ) oxalate since 1879 in photography as a developer. It is still used for optical glasses.