pH Scale Practice

Which solution has the highest pH?

• A

• B

• C

• D

Compared to a 1.0-liter aqueous solution with a pH of 7.0, a 1.0-liter aqueous solution with a pH of 5.0 contains

• 10 times more hydronium ions

• 100 times more hydronium ions

• 10 times more hydroxide ions

• 100 times more hydroxide ions

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

• increases by 1

• increases by 10

• decreases by 1

• decreases by 10

Compared to a solution with a pH value of 7, a solution with a thousand times greater hydronium ion concentration has a pH value of

• 10

• 7

• 3

• 4

Which change in the H⁺ ion concentration of an aqueous solution represents a decreaseof one unit on the pH scale?

• a tenfold increase

• a tenfold decrease

• a hundredfold increase

• a hundredfold decrease

Which statement describes characteristics of a 0.01 M KOH(aq) solution?

• The solution is acidic with a pH less than 7.

• The solution is acidic with a pH greater than 7

• The solution is basic with a pH less than 7.

• The solution is basic with a pH greater than 7.

When the hydronium ion concentration of an aqueous solution is increased by a factor of 10, the pH value of the solution

• decreases by 1

• increases by 1

• decreases by 10

• increases by 10

The pH of a solution is 7. When acid is added to the solution, the hydronium ion concentration becomes 100 times greater. What is the pH of the new solution?

• 1

• 5

• 9

• 14

When the pH of an aqueous solution is changed from 1 to 2, the concentration of hydronium ions in the solution is

• decreased by a factor of 2

• decreased by a factor of 10

• increased by a factor of 2

• increased by a factor of 10

When the pH of a solution is changed from 4 to 3, the hydronium ion concentration of the solution

• decreases by a factor of 10

• increases by a factor of 10

• decreases by a factor of 100

• increases by a factor of 100