How to judge whether a substance is salt?

By definition:

Salt refers to a kind of compound in which metal ions or ammonium ions (NH4) are combined with acid ions or nonmetal ions. Such as sodium chloride, calcium nitrate, ferrous sulfate, ammonium acetate, calcium sulfate, copper chloride, sodium acetate, etc.

Judging from the naming:

Anaerobic acid salt is called "some chemical substance", such as sodium chloride;

Oxyacid salts are called "some kind of acid", such as potassium sulfate.

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