Question

1. In the following balanced reaction, if the rate of disappearance of A is equal to 5 M/s, what is the rate of appearance of C?

2 A + B → 4 C + 3 D

	a.	10 M/s
	b.	20 M/s
	c.	2.5 M/s
	d.	5 M/s

2. Dissolving acetic acid and sodium chloride in water would create a buffer solution.

True

or

False

3.  

For the following chemical equilibrium, what is the proper equilibrium expression (K_eq)?

A + 2 B ↔ 3 C + 3 D

	a.	[C]4 [D]3 / [A]2 [B]
	b.	[C]3 [D]3 /  [A] [B]2
	c.	[A] [B] / [C] [D]
	d.	[A]2 [B] / [C]4 [D]3

4.

A solution of an acid (HA) has a pH of 2.85 when the [HA] = 0.095 M. What is the K_a of this acid?

	a.	2.5 x 10-3
	b.	2.5 x 10-6
	c.	2.10 x 10-5
	d.	59.7

5. An acid (HA) with a K_a of 4.75 x 10^-6 was dissolved in water along with it’s conjugate base (A^-). What is the pH of this solution if the [HA] = 0.157 M and the [A^-] = 0.089 once the solution reaches equilibrium?

	a.	5.57
	b.	5.07
	c.	4.13
	d.	3.14