pracfinal07f

pracfinal07f - CHEMISTRY l A PRACTICE PROBLEMS FOR FINAL...

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CHEMISTRY lA PRACTICE PROBLEMS FOR FINAL EXAMINATION These problems are related only to material covered since the second hour examination. The final examination will cover all of the topics that were discussed this quarter. You should also study the practice problem sets for Examinations I and 11. The solubility of Fe(OH)2 in water is 7.9 x mole/L at 25°C. What is &? Fe(OH)z(s) 2 Fe 2+(aq) + 20H-(aq) [Fe2+] = 7.9 x 10-6M, [OH-] = 2 x (7.9 x = 1.58 x 1OP5M K, = [Fe2+:([OH-l2 = (7.9 x 10-6)(1 .58 x 10-5)2 = (7.9 x 10-6)(2.5 x 10-lo) = 2.0 x 10-l5 Calculate the pH of a solution that is made by adding 0.10 mole of solid IVaOH to 1 .OL of 0.10M acetic acid. You may assume that the volume does not change upon the addition of solid. Initial: 0.10M 0.10M O.OM CH3COOH + NaOH + CH3COONa + H20 Final: 0.10M All of the acetic acid is neutralized. The salt that is formed, sodium acetate, will hydrolyze: Initial: 0.10M CH3COO- + H20 2 CH3COOH + OH- Equilibrium: 0.10-x x x A 0.20 mole quantity of CuSO, is added to 1 .OL of 1.20M ammonia, NH3, solution. The complex ion CU(NH~)~ will be the product of the reaction. If the formation constant, Kf (Zumdahl writes
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pracfinal07f - CHEMISTRY l A PRACTICE PROBLEMS FOR FINAL...

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