Acid and Bases
(1) Arrhenius concept: According to Arrhenius concept all substances which give H+ ions when dissolved in water are called acids while those which ionise in water to furnish OH– ions are called bases.
;
Some acids and bases ionise almost completely in solutions and are called strong acids and bases. Others are dissociated to a limited extent in solutions and are termed weak acids and bases. , etc., are examples of strong acids and
are strong bases. Every hydrogen compound cannot be regarded as an acid, e.g.,
is not an acid. Similarly,
, etc., have
groups but they are not bases.
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