When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the

January 2018 NY Regents Chemistry Exam

48 When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the solution (1) increases by 1

(2) increases by 10

(3) decreases by 1

(4) decreases by 10

Solution: As the concentration of hydrogen ions decreases, pH increases (solution becomes more basic)! Each 1 pH unit is equal to a factor of 10.

Answer: 1

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