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AQUEOUS EQUILIBRIA PROBLEM SET

AQUEOUS EQUILIBRIA PROBLEM SET. 1. Calculate the [H + ] in a solution formed by mixing 50.0 ml of 0.10 M HCN (K a = 4.95 x 10 -10 ) with 50.0 mL of 0.50 M NaCN.  2. To make a buffer of pH = 4.25 from acetic acid

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AQUEOUS EQUILIBRIA PROBLEM SET

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  1. AQUEOUS EQUILIBRIA PROBLEM SET

  2. 1. Calculate the [H+] in a solution formed by mixing 50.0 ml of 0.10 M HCN (Ka = 4.95 x 10-10) with 50.0 mL of 0.50 M NaCN.  2. To make a buffer of pH = 4.25 from acetic acid (Ka = 1.80 x 10-5) and sodium acetate, what is the ratio of NaC2H3O2 to HC2H3O2 needed?  3. A solution contains 1.0 M NH4Cl and 1.0 M NH3. Kb = 1.8 x 10-5 a. Calculate the pH. b. Calculate the pH after 0.10 mole HCl gas is bubbled into 1.0 L of the original solution.

  3. 4. A solution is made by combining 500.0 mL of 2.00 M C5H5N (pyridine) and 500.0 mL of 0.200 M C5H5NHCl (pyridinium chloride). (Kb = 1.7 x 10-9 for pyridine) a. Calculate the [OH-] in this solution. b. Calculate the [OH-] in the solution after 0.0080 mole of KOH is added.  5. Consider a solution of the weak base aniline C6H5NH2 (Kb = 4.0 x 10-10). What is the pH of a solution prepared by adding 50.0 mL of 0.10 M aniline to 50.0 mL of 0.10 M HCl?

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