Preparation of Potassium Bifluoride

Preparation of Potassium Bifluoride. Perform the experiment in a fume cupboard, wear rubber gloves ). Pour 25 ml of a 40% hydrogen fluoride solution into a plati- 

For dehydration, place the platinum (nickel) crucible with the prepared salt ( 5 g) into a test tube with a standard ground-glass joint (Fig. 63). Preliminarily weigh the crucible and the salt with an accuracy up to 0.01 g. Connect the test tube to a vacuum system. Evacuate it (10- mmHg) first at room temperature during 10-20 min, and then at 150 °C on an oil bath or a bath with Wood s alloy. Dehydrate the substance up to a constant mass. Calculate the composition of the product according to the change in its mass. 

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