CHAPTER 10: Acids and Bases
1. From the following choices in the word bank, select the definition that best describes 1-
Word Bank:
Bronsted-Lowry Acid Bronsted-Lowry Base Arrhenius Acid Arrhenius Base
______________: Produces H + in solution
______________: Donates H+ or protons
______________: Produces OH in solution
______________: Accepts H + protons
2. In following reactions label the Acid, Base, Conjugate Acid, and Conjugate Base. It would help if you try and draw the structures: a.
𝑁𝐻
3
(𝑎𝑞) + 𝐻 b. 𝐻𝐶𝑙 (𝑎𝑞) + 𝐻
2 c. 𝐹 − (𝑎𝑞) + 𝐻
2
2
𝑂 (𝑙)
𝑂 (𝑙)
𝑂 (𝑙)



𝑁𝐻
𝐻
3
𝑂
4
+
+
(𝑎𝑞) + 𝑂𝐻
(𝑎𝑞) + + 𝐶𝑙
𝐻𝐹 (𝑎𝑞) + 𝑂𝐻 −
−
−
(𝑎𝑞)
(𝑎𝑞)
(𝑎𝑞)
3. From the reactions above, can you now explain what amphoteric means?
4. Write formulas for the following:
(a) The conjugate acid of the cyanide ion, CN -
(b) The conjugate base of perchloric acid, HClO
4

CHAPTER 10: Acids and Bases
5. T/F: The stronger the acid the weaker the conjugate base. Moreover, stronger bases have weaker the conjugate acids.
6. T/F: Strong acids are acids that dissociate completely in the presence of water/soln.
7. T/F: The “Ka” or equilibrium constant is expressed as products/ reactants ... Therefore, for reaction HAc  H
3
O + + Ac ,
[𝐻
3
𝑂 + ][𝐴𝐶 −]
𝐾𝑎 =
[𝐻𝐴𝑐]
8. T/F: As polyprotic acids loose H + ions, the value for Ka decreases significantly.
9. Benzoic acid has a Ka = 6.5x10
-5 , and citric acid has a Ka=7.2x10
-4 . Which of the two is the stronger acid?
10. What is the pH of a solution that contains 25 grams of hydrochloric acid (HCl) dissolved in 1.5 liters of water?
11. What is the pH of a solution that contains 1.32 grams of nitric acid (HNO
3
12. Milk has an H
3
O + concentration of 4.5x10
-7 M. What is the value of [OH -
) (M.W. = 63.02 ) dissolved in 750 mL of water?
]? Is mile acidic, neutral, or basic?

CHAPTER 10: Acids and Bases
13. Lemon juice has a pH of about 2. What [H
3
O + ] concentration is this?
14. A cleaning solution is found to have [OH ] = 1 x 10 -3 M. What is the pH?
15. What is the pH of a buffer solution that contains 0.100 HF and 0.120M NaF? The Ka of HF is 3.5x10
-4 , and so the pKa = 3.46.