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NaK is pyrophoric and ignites immediately on contact with air.
NaK is a silvery liquid, with a density of 0.866 g/cm3 at standard conditions. It melts at −12.6 °C and boils at 785 °C.
NaK is sold by various chemical suppliers, though it is not accessible to the amateur chemist.
NaK can be made by mixing potassium metal with sodium, in a 77:23 ratio.
- Demonstration of pyrophoricity
- Dry solvents (dioxane e.g.)
- Coolant (VERY DANGEROUS)
NaK is pyrophoric and highly dangerous to work with.
NaK can be stored under dry light mineral oil for several months. The oxidation of the alloy will also yield potassium superoxide which is very dangerous in the presence of moisture.
Ampouling is recommended.
NaK is difficult to properly dispose of. Long chain alcohols can be used to neutralize it, as the reaction proceeds slow.