Identification C:
Dilute 1 ml of solution S (see Tests) to 100 ml with water R. To 5 ml of the solution add 0.15 ml of freshly prepared copper sulphate solution R and 2 ml of freshly prepared dilute sodium hydroxide solution R. The solution is blue and clear and remains so after boiling. To the hot solution add 4 ml of dilute hydrochloric acid R and boil for 1 min. Add 4 ml of dilute sodium hydroxide solution R. An orange precipitate is formed immediately.
2 juli 1999