From: Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Date: 08/23/00-09:49:39 PM Z
Irving Young wrote:
> ... I have tried making Ferric Citrate by the
> method descibed in Dick Steven's book,"Making Kallitypes". My problem is
> that I seem to have made a batch of extraordinary strength and I dont
> Know why. The pH is 1.35, and the S.G. is 1.218, which according to the
> graph relating S.G. to strength gives me something like 35%, which I
> feel cannot be right. ...
After having made many measurements of pH and S.G. for various Ferric
Oxalates, I have found that the determination of solution strengths by
Dick Stevens is not valid. This is mainly because any impurities in the
FO such as Oxalic Acid will disrupt the measurement of S.G. However,
the Ferric Citrate may be pure and I have not done measurements on
Ferric Citrate. But be aware of this concern that the relationships
promoted in Dick Stevens' book involving S.G. measurements are suspect
at least for Ferric Oxalate. Details of some of my measurements can be
found in my Guide on my web site (link below) in the sections studying
FO powders.
-- Jeffrey D. Mathias http://home.att.net/~jeffrey.d.mathias/
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