A tenfold increase in hydronium ion concentration is represented by

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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