Problem Set 7 Answer the following questions on a separate sheet of paper. The questions must be done in the order given. If you are skipping a question, leave space in case you decide to return to the problem. You do not need to recopy the question, simply indicate its number in the upper left corner. 1. Hydrazoic acid, HN, has an acid dissociation constant of 25x10 a. Calculate the equilibrium concentrations of all substances if the initial concentration of HN; is 0.0750 M. b. Determine the pH of the solution c. Would a 0.0750 M solution of HBr have a higher or lower pH than the 0.0750M HN, solution? Explain why of HA 2. A known acid, HA, has a percent dissociation of 15.6%. A chemist prepared a 0.870 M solution a Determine the concentration of HA, Hand A once the equilibrium has been established. b. Determine the K of the weak acid. 3. The pH of a 0.550 M of weak base. A. 159.93 at 25C. What is the K, of the base? 4. Calculate the pH at 25C of a 0.590 Maqueous solution of a weak base with a Ky value of 1.27 x 10 5. Using your knowledge of how molecular structure can influence acid strength, explain the following statements a H,AsO, is a stronger acid than MASO b. H:Te is a stronger acid than H.O C CH.CH.COOH is a stronger acid than CH.CH.CH.CH 6. Calculate the pH of a 0.333 M CHOK solution at 25C K. for CHOH is 1.3 x 10