[Alt-photo] Cyanotype chemistry question

Kelcy Patterson jimbobnola at cox.net
Sat Jan 25 19:18:51 UTC 2020


Hi, the first formula is grouped by ions: NH4 = ammonium ion, Fe = ferric (iron III) ion, C2O4 = oxalate ion, with .3H2O being 3 waters of hydration.

The second formula is grouped by total elements. It is the same, minus the 3 waters of hydration.

Jim Patterson, New Orleans

> On January 25, 2020 at 11:27 AM Chris Seiberling via Alt-photo-process-list <alt-photo-process-list at lists.altphotolist.org mailto:alt-photo-process-list at lists.altphotolist.org > wrote:
> 
> 
>     Hello photographic chemists (and others):
> 
>     Mike Ware's 'New' Cyanotype calls for Ammonium iron(III) oxalate-- (NH4)3[Fe(C2O4)3].3H2O. He says this is also known as ferric ammonium oxalate. But I understand ferric ammonium oxalate's formula to be C6H12FeN3O12 ? Is there a practical difference? I’m not enough of a chemist to understand the formulaic implications.
> 
>     Thanks, Chris Seiberling
> 
> 
> 
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