Chemistry Reference
In-Depth Information
18. The ionization constants for four bases are shown here. Select the
constant that represents the strongest base.
a) K
b
= 1.0 × 10
-3
c) K
b
= 1.0 × 10
-7
d) K
b
= 1.0 × 10
-9
19. The ionization constants for four bases are shown here. Which of the
bases represented would have the strongest conjugate acid?
a) K
b
= 1.0 × 10
-3
b) K
b
= 1.0 × 10
-5
c) K
b
= 1.0 × 10
-7
d) K
b
= 1.0 × 10
-9
20. What is the conjugate base of the acid NH
4
+
?
a) NH
3
+
b) K
b
= 1.0 × 10
-5
b) NH
3
c) NH
3
-
d) NH
2
+2
Part III—Calculations
Perform the following calculations. Round your answers to the correct
number of significant digits and include units.
21. What volume of a 3.0 M solution of NaOH would be required to
completely neutralize 2.0 L of a 3.0 M solution of H
2
SO
4
?
22. What volume of 2.0 M NaOH would be required to completely
neutralize 250 ml of 1.0 M HCl?
23. What is the pH and pOH of a solution with a concentration of OH
-
ions of 0.000001 M?
24. What is the pH and pOH of a solution with a concentration of H
3
O
+
of 0.001 M?
25. What is the pH and pOH of a solution with a concentration of H
3
O
+
of 0.000073
M?
Answer Key
The actual answers will be shown in brackets, followed by the explana-
tion. If you don't understand an explanation that is given in this section, you
may want to go back and review the lesson that the question came from.
Lesson 9-1 Review
1.
[polar]—Remember: “Likes dissolve likes.”
2.
[insoluble]—Remember: “Likes dissolve likes.”
moles of solute
liters of solution
3.
[molarity]—
Molarity (M) =
