define acid and base
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Acids => A chemical term for sour materials that have a pH below 7.0 (on a 14-point scale).
Base => A chemical that can accept protons from hydrogen molecules, or donate a pair of electrons.
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ACID: the substances which turns the colour of blue litmus paper red are called acid.
BASE: the sunbstances which changes the colour of red litmus paper blue are called base.
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