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Preparation of the solution for titration
Place an aliquot portion of the solution containing not less than 20 mg Cu in a 500 ml Erlenmeyer flask.
Drive off any excess oxygen present by boiling briefly. Make up to volume of about 100 ml water. Add 5 ml of nitric acid (4.1), bring to boiling and allow to boil for about half a minute.
Remove the Erlenmeyer flask from the heating apparatus, add about 3 g of urea (4.2) and resume boiling for about half a minute.
Remove from the heating apparatus and add 200 ml of cold water. Where necessary, cool the contents of the Erlenmeyer flask to ambient temperature.
Gradually add ammonium hydroxide solution (4.4) until the solution becomes blue, then add 1 ml in excess.
Add 50 ml of ammonium bifluoride solution (4.3) and mix.
Add 10 g of potassium iodide (4.6) and allow it to dissolve.
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