By W. T. Elwell
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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 (wash the electrodes with water at the same time), and filter the solution, without delay, through a fluted N o . 541 Whatman paper (9 cm); wash the mercury and paper with warm water. T o the filtrate, add 10 g of ammonium chloride and a small amount of filter-paper pulp, then make the solution just ammoniacal to methyl-red. Boil the solution for 1 to 2 minutes, then cool slightly.
To 5 g of gelatine add 150ml of water; transfer the container to a hot-water bath and stir the solution gently until the gelatine has dissolved. Pour the warm solution into 250ml of water; stir the water well during this addition, cool and dilute the solution to 500 ml. Pour the aluminon solution slowly into the gelatine solution—stir throughout the addition. Transfer the solution to a glass-stoppered bottle and store in a dark cupboard for 2 days before using. Store the reagent in the dark when not in use.
Add 10 ml of the buffer solution, and boil the solution for 2 to 3 minutes. Add 10 drops of the P A N indicator, then titrate the hot solution with the standard zinc solution (0Ό5Μ) until the colour of the solution changes from green to violet. Add 30 ml of sodium fluoride solution (saturated), boil the solution for 2 to 3 minutes, add 5 drops of the P A N indicator, then titrate the hot solution with the standard zinc solution (0Ό5 M) until the violet colour is again produced. The volume of standard zinc solution added in the second titration is equivalent to the amount of aluminium present in the sample.