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Development and separation of the complex
To each separating funnel (6.2, 7.1 and 7.2), add in the following order:
— 10 ml of the copper solution (4.2)
— 20 ml of the ascorbic acid solution (4.3);
mix thoroughly and wait for two or three minutes. Then add:
— 10 ml of n-butyl acetate (4.4), using a precision pipette;
— 20 ml of the thiocyanate solution (4.5).
Shake for one minute to extract the complex into the organic phase; allow to separate; after the separation of the two phases, draw off the entire aqueous phase and discard it; then wash the organic phase with:
— 10 ml of the stannous chloride solution (4.6).
Shake for one minute. Allow to separate and draw off the entire aqueous phase. Remove the organic phase in a test tube; this will make it possible to collect the drops of water in suspension.
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