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Unformatted text preview: ing does not include the Cu2+ ion because it behaves rather
unpredictably when subjected to the reagents used here to effect the separation of a
mixture of these cations. In more elaborate analytical schemes the copper gets removed
early on by precipitating it as the sulfide from a 0.3 M acid solution saturated with
hydrogen sulfide. The sulfide ion concentration in such a solution is so incredibly low
that only CuS (Ksp ~ 10-35) precipitates at that point.
The first part of the experiment comprises a series of diagnostic tests in which you will
determine experimentally how six of the eight salts respond to the various treatments that
will comprise the overall analytical scheme. These tests may all be performed in a
single laboratory period if you have thoroughly studied the experiment before you
come to lab so that you know exactly what you will be doing and in what order. 31 Safety: Gloves must be worn at all times. Some of the reagents used in this experiment
can cause burns or other ski...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.
- Spring '07