An acid is something that has a pH less than 7.0.
Sometimes the abbreviation HA is used to mean an acid.
The chemistry definition of an acid is: "a substance that donates a hydrogen ion (H+) to another substance, which is called a base. (Or give out hydrogen ions when dissolved in water.)"
Properties of an Acid.
Acids can burn the skin. The burn can be serious or minor depending on the kind of acid and how concentrated it is.
Burns like this can cause serious damage quickly. Chemical burns like this need medical attention.
Acids and Bases can combine with each other and cancel each other's effects. This is called neutralisation.

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