I have no idea in which conditions this compound is formed and would like to find out any / different ways it can be prepared (any easy way not requiring expensive equipment would be great).


Iron(III) arsenate or more commonly Ferric orthoarsenate is normally found in nature in the form of a mineral called Scorodite.

It can also be prepared chemically. From here:

The monohydrate, $\ce{FeAsO4.H2O}$, is precipitated from solution. The salt, when dried in air, is a dull white insoluble substance, containing one molecule of water. When heated at 100° C. it becomes anhydrous. On treatment with sodium hydrogen carbonate solution, both the monohydrate and the anhydrous salt cause effervescence to take place, a soluble double arsenate being produced. It would appear, therefore, that the hydrated salt is acidic, and determinations of its basicity indicate that its formula is $\ce{FeO.AsO2(OH)2}$.

Colloidal ferric arsenate is prepared by the action of ammonium hydroxide on the insoluble salt.

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