# q3ps11 - 5 A 0.08 M CH 3 NH 2 solution is titrated against...

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CH302 Spring 2011 Practice Quiz 3—The TA Version 1. Which of the following pairs of solutions would result in a buffer upon mixing? 2 2 SO 4 3. 100 mL of 1 M NH 3 3 4. 150 mL of 3 M Ba(OH) 2 & 200 mL of 2 M HClO 5. 100 mL of 1 M CH 3 COOH & 50 mL of 1 M NaOH 2. What would be the pH of a solution prepared from 2 L of H 2 O, 85 g of NH 3 and 98 g of NH 4 Br? Assume the K b of ammonia is 2x10 -5 . 1. 4 2. 5.4 3. 10 4. 8.6 5. 7 3. Two liters of a buffer containing 0.6 M CH 3 NH 2 and 0.8 M CH 3 NH 3 Cl has 102.4 g of HI added to it. What is the new pH? Assume the K b of CH 3 NH 3 is 6x10 -4 . 1. 6 2. 3 3. 11 4. 4 5. 10 6. 8 4. 100 ml of a 0.08 M CH 3 CH 2 NH 3 Cl solution is titrated against a 0.08 M RbOH solution. Assuming the K b of CH 3 CH 2 NH 2 is 1x10 -10 , what is the pH when the total volume of the solution is 150 ml? (There is a short cut way to answer this question.) 1. 3 2. 7 3. 10 4. 4 5. not enough information

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Unformatted text preview: 5. A 0.08 M CH 3 NH 2 solution is titrated against a 0.08 M HCl solution. Assuming the K b of CH 3 NH 2 is 4x10-10 , what is the pH at the equivalence point? 1. 3 2. 7 3. 9 4. 5 5. not enough information 6. If 100 ml of 0.2 M HClO 3 is titrated to a pH of 7 with 0.4 M LiOH, what is the overall volume of the solution at the endpoint? 1. 50 ml 2. 150 ml 3. 1.5 4. Not enough information is provided 7. A student erroneously calculated that a solution consisting solely of a weak base dissolved in water had a pH of 6. Which two of the following might have been true? I. K b < 10-11 II. K b > 10-3 III. C b > 10-1 IV. C b < 10-4 1. I and IV only 2. II and III only 3. I and III only 4. II and IV only 8. An aqueous system with Na 2 CO 3 , NaCl and NH 4 Cl dissolved in it would require how many equations to find all the unknown equilibrium concentrations? 1. 3 2. 7 3. 4 4. 6 5. 9...
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q3ps11 - 5 A 0.08 M CH 3 NH 2 solution is titrated against...

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