Acid

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Zinc, a typical metal, reactin wi hydrochloric acid, a typical acid

An acid (frae the Laitin acidus/acēre meanin sour[1]) is a chemical substance whose aqueous solutions are characterized bi a sour taste, the ability tae turn blue litmus reid, an the ability tae react wi bases an certain metals (lik calcium) tae furm sauts. Aqueous solutions o acids hae a pH o less nor 7. A lawer pH means a heicher acidity, an thus a heicher concentration o hydrogen ions in the solution. Chemicals or substances havin the property o an acid are said tae be acidic.

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