Potassium nitrate
Modern production

Potassium nitrate can be made by combining ammonium nitrate and potassium hydroxide.

An alternative way of producing potassium nitrate without a by-product of ammonia is to combine ammonium nitrate, found in instant ice packs, and potassium chloride, easily obtained as a sodium-free salt substitute.

Potassium nitrate can also be produced by neutralizing nitric acid with potassium hydroxide. This reaction is highly exothermic.

On industrial scale it is prepared by the double displacement reaction between sodium nitrate and potassium chloride.
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