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Unformatted text preview: Chapter 11 Worksheet 1. Explain what happens to the: a. pH of a solution of phosphoric acid after the addition of solid sodium dihihydrogen phosphate. pH would increase as you shift the equilibrium towards the reactant the intact phosphoric acid, decreasing the concentration of H3O+. b. The percentage of deprotonation of HCN in a hydrocyanic solution after the addition of hydrobromic acid. You are adding another acid, increasing the concentration of H3O+, shifting the equilibrium towards the reactants and DECREASING deprotonation. c. The pKa when pyridinium chloride is added to an aqueous solution of pyridine. When you add pyridinium chloride, you are adding a product of the protonation of pyridine, so the [OH-]would decrease, so the pOH would increase, the pH would decrease. Ka would not change and the pKa would also not change as the concentration of the other constituents...
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