Exam 2A, Spring 2018

1. Complete and balance the following in aqueous solution.

a. cyanate ion plus perchloric acid

b. hydrogen phosphate ion plus magnesium hydroxide

c. hydroiodic acid plus rubidium hydroxide

2. Write the mass action expression for K_c 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 rises?

b. sodium carbonate 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 0.010 M solution of hydrochloric acid

b. A 0.010 M solution of potassium hydroxide

5. Find the pH and per cent ionization for a 0.0010 M solution of hypoiodous acid, HIO. Show all of your work. K_a = 2.3×10^–11

Answers