CHEM 1332 Spring 2007 Exam III

CHEM 1332 Spring 2007 Exam III - CHEM 1332 SPRING 2007 Test...

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1 CHEM 1332 SPRING 2007 Test 3 Version 1 1. Which of the following mixtures in aqueous solution would result in the formation of a buffer solution? (A) 50 mL of 0.25 M NaCl and 50 mL of 0.35 M HCl (B) 50 mL of 0.25 M NH 4 Cl and 50 mL of 0.35 M NH 4 Br (C) 50 mL of 0.00025 M NH 3 and 50 mL of 0.35 M NH 4 Br (D) 50 mL of 0. 25 M NH 3 and 50 mL of 0.35 M NH 4 Br (E) All would produce a buffer solution. 2. Calculate the pH of a buffer solution that is 0.25 M CH 3 COOH(aq) and 0.25 M NaCH 3 COO. (Ka for acetic acid is 1.8 x 10 -5 ). 3. 25.0 mL of 0.20 M NH 3 (aq) is titrated with 0.10 M HCl(aq). Calculate the pH after 25.0 mL of the acid has been added. The K b for NH 3 is 1.8 x 10 -5 . 4. 25.0 mL of 0.20 M NH 3 (aq) is titrated with 0.10 M HCl(aq). Calculate the pH after 50.0 mL of the acid has been added. The K b for NH 3 is 1.8 x 10 -5 . 5. Which of the following statements is incorrect? (A) The pH at the equivalence point of a titration of a strong acid with a strong base is 7. (B) The pH at the equivalence point of a titration of a strong base with a strong acid is 7. (C) The pH at the equivalence point of a titration of a weak acid with a strong base is greater than 7. (D) The pH at the equivalence point of a titration of a weak base with a strong acid is less than 7. (E) The pH at the equivalence point of a titration of a weak acid with a weak base is equal to 7.
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