Exam 2B, Spring 2018

1. Complete and balance the following in aqueous solution.

a. thiocyanate ion plus perchloric acid

b. hydrogen phosphate ion plus nitric acid

c. hydrobromic acid plus cesium hydroxide

2. Write the mass action expression for Kp for each of the following:

a. P₄(s) + H₂(g) → ← PH₃(g)

b. CH₄(g) + Cl₂(g) → ← CCl₄(l) + HCl(g)

c. Fe(s) + CO(g) → ← Fe(CO)₅(l)

3. Consider the reaction 2 NaHCO₃(s) → ← Na₂(s) + H₂O(g) + CO₂(2). Which does the reaction shift if:

a. the humidity decreases?

b. sodium bicarbonate is added to the reaction?

4. Write the appropriate balanced reaction using Brønsted-Lowry theory, find the hydronium ion concentration, the hydroxide ion concentration, pH, and pOH for the following, including units:

a. A 0.0010 M solution of hydrochloric acid

b. A 0.0010 M solution of lithium hydroxide

5. Find the pH and per cent ionization for a 0.0010 M solution of hypobromous acid, HBrO. Show all of your work. K_a = 2.5×10^–9

Answers