The Dioxouranium (VI) cation can be separated and identifed using the Procedure

Question

The Dioxouranium (VI) cation can be separated and identifed using the Procedure described in this experiment. The spot test results for this cation with the following test reagents are:

K4Fe(CN)6 red-brown

KSCN/acetone no reaction

DMG/NH3 pale yellow

a) based on this data, what would be the best test reagent for UO2 2+

b) the Rf value of UO2+ in the solvent system used in this module is 0.68. Explain which of the other cation test used in this experiment it would interfere with, what alternate test reagent you would therefore use to identify the other cation, and which of the two tests should be preformed first?

Explanation / Answer

a) Based on the data given above, the best test reagent for UO2^2+ would be,

K4(Fe(CN)5 which gives a red-brown color

b) Fe2+ would interfere with the gi ven Rf vaue of 0.68 for UO2^2+ cation. An alternate test for Fe2+ would be to first oxidize Fe2+ to Fe3+ by HNO3 and then form hydroxide of it with NH4Cl/NH3 which is brown in color. We would perform KSCN/acetone and DMG/NH3 tests which gives a pale yellow color first for the experiment.

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