1 .		Components of Air Mole Fraction nitrogen 0.781 oxygen 0.209 argon 0.010 What is the partial pressure of oxygen (in mm Hg) in the atmosphere when the atmospheric pressure is 760 mm Hg?
2 .		The concentration of Br- in seawater is 8.3 x 10-4 M. Assuming that a liter of seawater has a mass of 1.0 kg, what is the concentration of Br- in ppm?
3 .		Of the following atmospheric pollutants commonly found in urban areas, which typically has the lowest concentration?
4 .		A solution is prepared that contains 25.0 mL pyridine, C5H5N, d = 0.978 g/mL and 27.6 g pyridinium hydrochloride, C5H5N • HCl. The volume of the aqueous solution is 250. mL. What is the pH of this buffer solution (Kb(C5H5N) = 1.5 x 10-9)?
5 .		The pH of a solution formed by mixing 20.0 mL of 0.250 M formic acid, HCOOH, and 8.0 mL of 0.400 M NaOH is 3.99. Determine the Ka for formic acid.
6 .		If x represents the molar solubility of Ba3(AsO4)2, what would be a proper expression for the Ksp of this compound?
7 .		What is the maximum allowable pH a 0.0050 M solution of Co(NO3)2 can have to prevent the precipitation of Co(OH)2? (Ksp for Co(OH)2 = 1.6 x 10-15.)
8 .		Calculate the pH of a solution made by adding 0.0300 mol of K3N to enough water to make 0.400 L of solution.
9 .		Which of the following acids, if in solutions of equal concentration, is the most acidic?
10 .		Determine the pH of 0.35 M HOCl. (The Ka of HOCl is 2.9 x 10-8.)
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