Transition elements
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I'm currently investigating different methods of analysis for copper 2+, and I am unsure which indicator to use for the EDTA titration.
021108
Corrie writes ....
According to Vogel's well-known textbook on Quantitative Inorganic Analysis, the indicator to use when titrating Cu2+ with EDTA (in the presence of ammonia solution) is Fast Sulphon Black F. The colour change is from purple to dark green. The indicator is made up by dissolving 0.5 g solid in 100 cm3 of distilled or deionised water.
This method is only suitable for dilute solutions of Cu2+ - up to 25 mg Cu2+/100 cm3 water. If the copper concentration is higher, then the intense blue colour masks the colour change at the end-point.
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updated: 02 November 2008
