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Potassium easily reacts with oxygen, and many oxidizing agents like halogens, chlorates, and nitrates. Potassium reacts with all acids, such as acetic or hydrochloric acid to form a potassium salt and hydrogen gas. Potassium will also react with alcohols. One of the most interesting reactions only takes place in a vacuum. When potassium is placed on a sheet of paper, it will actually rip the oxygen atoms out of the paper and char it black.

However, potassium cannot react with ice, as it needs a liquid medium to proceed.

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