[lighting]

1. Will the Fe(OH)3 precipitate in water in air transform to Fe2O3?

2. Will the Fe(OH)2 precipitate in water in the glove box  transform to Fe3O4?

I'm confused for a long time. 

Thanks for your answers and recommended references.

[DevaDevil]

1) Ferric hydroxide is already a precipitate, and as such the oxidation with just air (oxygen) dissolved in water will be extremely slow.

2) With glove box you mean deairated solution (with Ar or nitrogen)? While Ferrous hydroxide is slightly more soluble than ferric oxide, there is no oxidating agent available in deairated solutions. (if you use pure water as I do) So it will not oxidise to an oxide.

I assume in both cases you use at least distilled water to put your precipitate in

[FeLiXe]

Fe(OH)3 transforms to Fe2O3 when you heat it up. It is just about evaporating the water

[lighting]

Thanks for your *delete me*

In fact, in my experiment, I got a mixture of (NH4)FeCl3 and Fe(NH3)xCly(may be exist due the hydrolyzation behavior of the mixture in water and a green precipitate generated)

I found that
1) if the mixture hydrolyzed in air in water at room temperature and maintained for two days, the final product after filtrated is Fe2O3 and Fe3O4 according to the XRD pattern.

2) if the mixture hydrolyzed in Ar(glove box) in water(tap water,may contains a little oxygen,-_-!!) at room temperature and maintained for two days, the final product after filtrated is Fe2O3 and Fe3O4 too, but the amount of Fe2O3 is much lower than that hydrolyzed in air.

I guess that the mixture only contain Fe2+ and the Fe2O3 and Fe3O4 should come from the Fe(OH)3 and Fe(OH)2, But I am not sure about this. Do the Fe(OH)3 and Fe(OH)2 lose H2O at room temperature?