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Solve the following problems neatly. Upload your answers using the “create” button in the google
classroom assignment post.
1. (3 pts). A sample of nitrosyl bromide (NOBr) decomposes according to the equation
2 NOBr(g) à 2 NO(g) + Br2(g)
An equilibrium mixture in a 5.00-L vessel at 100 °C contains 3.22 g of NOBr, 3.08 g of NO, and
4.19 g of Br2. Calculate Kc.
2. (3 pts). Calculate [H+] for each of the following solutions, and indicate whether the solution is
acidic, basic, or neutral:
(a) [OH-
] = 0.00045 M
(b) [OH-
] = 8.8 X 10-9 M
3. (3 pts). Lactic acid (CH CH(OH)COOH) has one acidic hydrogen. A 0.10 M solution of lactic acid
has a pH of 2.44. Calculate Ka for lactic acid.
4. (3 pts). Calculate the molar concentration of OH- ions in a 0.075 M solution of ethylamine
(C2H5NH2;Kb = 6.4 * 10-4). Calculate the pH of this solution.
5. (3 pts). If the molar solubility of CaF2 at 35°C is 1.24 x 10-3 mol/L, what is Ksp at this
temperature?
