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28 Which statement describes one acid-base theory?(1) An acid is an H+ acceptor, and a base is an H+ donor.
(2) An acid is an H+ donor,. and a base is an H+ acceptor.
(3) An acid is an H- acceptor, and a base is an H-donor.
(4) An acid is an H- donor, and a base is an H­ acceptor.