Identifying Potassium Minerals
Flame Test. Volatile potassium salts give a characteristic pale violet flame color. The potassium flame will, however, commonly be obscured bye the stronger yellow flame of sodium. This difficulty can be overcome bye filtering the flame through a piece of blue glass. The sodium flame, being a mono – chromatic light, cannot pass through the blue glass, while the violet flame of potassium will be visible.
When the potassium does not exist in the mineral in a volatile state, as in the case with potassium silicates, the powdered mineral must be first thoroughly mixed with gypsum (CaSO4. 2H2O) and the mixture introduce into the Bunsen burner flame on a platinum wire. There will be a reaction between the two, and the potassium will be liberated in the form of a sulphate, which, being a volatile salt, will give the flame color. It will be momentary in duration and must be viewed through the blue glass.
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