Weigh 1.000 g in a tared flask containing 2 g of sand R, previously dried to constant mass, and a small glass rod. Heat on a water-bath for 2 h with frequent stirring and dry in an oven at 100°C to 105°C until two consecutive weighings do not differ by more than 2.0 mg; the second weighing is carried out after drying again for 1 h.
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