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7.—7.1.1 Carry out a solubility test on the sample in water at room temperature in the proportion of 2 g per 100 ml.
7.1.2 Weigh 5, 7 or 10 g of the sample to the nearest 0.001 g, as shown in the Table, and place in a 500 ml graduated flask. From the result of the solubility test, proceed as follows:
(a)Add sufficient water to dissolve the sample; shake, and when completely dissolved, make up to volume and mix thoroughly.
(b)Add 50 ml water and then 20 ml hydrochloric acid solution (4.1). Swirl and leave undisturbed until the evolution of carbon dioxide has ceased. Add 400 ml water and shake for half an hour on the rotary shaker (5.2). Make up to volume with water, mix and filter through a dry paper into a dry receiver. Discard the first portion of the filtrate.
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