Re: Ferric Oxalate..
nadeaul@nbnet.nb.ca
Mon, 9 Jan 1995 00:04:11 +0300
>I just bought some Ferric Oxalate from a major chemical house. The problem
>is that I can't get it to dissolve (a 24% solution). Half of it has dissolved
>into the familiar green solution and half is just a lump of yellow semi-solid!
>I've been working at it with mild-heat and a magnetic stirring device, but
>very little of it is dissolving. I've added around .7g of Oxalic Acid
>and nothing else. Since I don't have a hot-plate and the stirrer isn't working
>I began wondering if this Ferric Oxalate (I believe its a tetra-hydrate) may
>just be more difficult to dissolve. Are different types of Ferric Oxalate
>(in regard to the amount of water in the solid) more difficult to dissolve
>than others? I read in the Bostic&Sullivan catalog that the addition of some
>EDTA can often help it dissolve- how much should I add for a 100ml?
>
>Any help would be appreciated,
>Adam
The only comment I can offer here, from *many* complaints that I have
received in the past, is that you may have made a mistake in getting your
ferric oxalate from a "major chemical house". When I was actively printing
in Pt I was very happy to find Bostick & Sullivan's ferric oxalate.
Others may want to confirm or deny this.
Luis Nadeau