June 2023 NY Regents Chemistry Exam
27 A tenfold increase in hydronium ion concentration is represented by
(1) a decrease of one unit of pH
(2) a decrease of 10 units of pH
(3) an increase of one unit of pH
(4) an increase of 10 units of pH
Solution: Each pH unit represents a factor of 10 in terms of concentration. Increasing hydronium ion concentration means lowering the pH.
Answer: 1
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