Friday
April 18, 2014

Homework Help: analytical chemistry

Posted by jody on Saturday, May 4, 2013 at 9:36pm.

A solution containing both Fe
3+
and Al
3+
can be selectively analyzed for Fe
3+
by
buffering to a pH of 2 and titrating with EDTA. Th
e pH of the solution is then raised
to 5 and an excess of EDTA added, resulting in the
formation of the Al
3+
- EDTA
complex. The excess EDTA is then back-titrated usi
ng a standard solution of Fe
3+
,
providing an indirect analysis for Al
3+
.
a.
Show that at a pH of 2, the formation of t
he Fe
3+
- EDTA complex is
favorable, while the formation of the Al
3+
- EDTA complex is not.

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