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Cumulative Exam

1 .      
Components of AirMole Fraction
nitrogen0.781
oxygen0.209
argon0.010

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, C5H5NHCl. 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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