Practice Exam III - SP09

Practice Exam III - SP09 - April, 2009 1 PRACTICE EXAM III...

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April, 2009 1 PRACTICE EXAM III 1. (a) What is the conjugate acid of the hydroxide anion? (b) What is the conjugate base of water? (c) Complete the following acid-base (proton transfer) reactions. Write “acid” or “base” below each species and “link together” the conjugate acid-base pairs, as shown in class: (i) NH 4 + (aq) + HCO 3 (aq) NH 3 (aq) + H 2 CO 3 (aq) (ii) CH 3 O (aq) + NH 3 (aq) CH 3 OH(aq) + NH 2 (aq) (d) Using the table of relative strengths of acids and bases (Fig 15.2, p. 692, which will be provided), will K c for equilibrium (c)(i) be greater or less than 1? Explain. 2. Place the letter corresponding to your answer on the blank line to the right of each question. (a) Which of the following is not a strong base? A. Ba(OH) 2 B. Al(OH) 3 C. LiOH D. KOH ______ (b) Which substance listed below produces a basic solution when dissolved in pure water? A. NH 3 B. NaBr C. NH 4 I D. KNO 3 ______ (c) Which substance listed above in question (b) produces an acidic solution when dissolved in pure water? ______ (d) In a buffer solution, the ratio [base]/[acid] should be no greater than. .. A. 1.0 B. 0.1 C. 10.0 D. 0.01 ______ (e) To prepare an acidic buffer solution, its pH must be: A. equal to the pK a of the acid B. greater than the pK a of the acid B. less than the pK a of the acid D. within ±1 pH unit of the pK a ______
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April, 2009 2 3. You are asked to prepare 100.00 mL of a basic buffer solution of pH = 10.00. Using the information below, answer the following:
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This note was uploaded on 03/26/2011 for the course CHEM 1032 taught by Professor Guenard during the Spring '06 term at Temple.

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Practice Exam III - SP09 - April, 2009 1 PRACTICE EXAM III...

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