By W. T. Elwell
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Dissolve 0-1 g of thymol-blue in 10 ml of water containing about 0-3 g of sodium hydroxide, cool and dilute the solution to 100 ml. COPPER SULPHATE SOLUTION. Dissolve 3-926 g of copper sulphate (CuSO^E^O) in water and dilute the solution to 1 litre. 2. Preparation of Calibration Graph (Note). Add, separately, 0-5,1-0, 1-5, 2Ό, 3 0 and 4 0 ml of the standard aluminium solution (1 ml = 0 0 1 mg Al) to six 100-ml calibrated flasks. A d d to each (and a blank), 1-5 ml of copper sulphate solution ( l m l Ξ 1-0 mg Cu), and dilute each solution to about 25 ml.
Note 2). Make further 1-ml additions of the hydrogen peroxide if necessary. Boil the solution for 3 minutes to decompose most of the peroxide, then dilute it to about 100 ml. Transfer the solution to a mercury-cathode cell, and electrolyse at 5 amp until the electrolyte is colourless (about 45 minutes). Rinse the cover-glass and inside of the beaker with water, and continue the electrolysis for a further 15 minutes. Remove the electrodes from the solution BERYLLIUM 45 (wash the electrodes with water at the same time), and filter the solution without delay through a fluted N o .
Dissolve 37 g of EDTA in water and dilute the solution to 1 litre. PAN INDICATOR. Dissolve 0 1 g of 1-(2-pyridylazo)-2-naphthol (PAN) (the quality of this reagent is often variable) in 100 ml of methanol. 30 ANALYSIS OF COPPER A N D ITS ALLOYS STANDARD ALUMINIUM SOLUTION. Dissolve 0 3 g of aluminium in 10ml of cone, hydrochloric acid, cool and dilute the solution to 250 ml. 1 ml ΞΞ 1 -2 mg of aluminium STANDARD COPPER SOLUTION (0Ό5Μ). Dissolve 3-18 g of copper in 30ml of nitric acid (1 + 1). Boil the solution for 2 to 3 minutes to expel oxides of nitrogen, then cool.