Download pH Scale and Concentration Date: Chemistry!

Name ________________
pH Scale and Concentration
Date:_________________
1. Which statement correctly describes a solution with a pH of 9?
1)
2)
3)
4)
It has a higher concentration of H 3O+ than OH– and causes litmus to turn blue.
It has a higher concentration of OH – than H3O + and causes litmus to turn blue.
It has a higher concentration of H 3O+ than OH– and causes methyl orange to turn yellow.
It has a higher concentration of OH – than H 3O+ and causes methyl orange to turn red.
2. The pH of 0.001M HCl is
1) 1
2) 2
3) 3
4) 4
3. The pH of a 0.1 M solution is 11. What is the concentration of H 3O+ ions, in moles per liter?
1) 1 × 10 –1
2) 1 × 10 –3
3) 1 × 10 –11
4) 1 × 10 –13
4. A solution with a pH of 2.0 has a hydronium ion concentration ten times greater than a solution with a pH of
1) 1.0
2) 0.20
3) 3.0
4) 20
5. When the hydronium ion concentration of a solution is increased by a factor of 10, the pH value of the
solution
1) decreases 1 pH unit
2) decreases 10 pH units
3) increases 1 pH unit
4) increases 10 pH units
6. The [H3O+ ] of a solution is 1 × 10 –8. This solution has a pH of
1) 6, which is acidic
2) 8, which is basic
3) 6, which is basic
4) 8, which is acidic
7. When the hydronium ion concentration of a solution is increased by a factor of 10, the pH value of the
solution
1) decreases 1 pH unit
2) decreases 10 pH units
3) increases 1 pH unit
4) increases 10 pH units
8. Which change in pH represents a hundredfold increase in the concentration of hydronium ions in a solution?
1) pH1 to pH 2
2) pH 1 to pH 3
3) pH 2 to pH 1
4) pH 3 to pH 1
9. As the pH of a solution is changed from 3 to 6, the concentration of hydronium ions
1) increases by a factor of 3
2) increases by a factor of 1000
3) decreases by a factor of 3
4) decreases by a factor of 1000
10. Which of these pH numbers indicates the highest level of acidity?
1) 5
2) 8
3) 10
4) 12
Chemistry!
Answer Key
pH Scale
1.
2
2.
3
3.
3
4.
3
5.
1
6.
2
7.
1
8.
4
9.
4
10.
1
Chemistry!