Quiz3A_key

Quiz3A_key - Chem 125 Winter 2008 Quiz #3 Clark Kent Dr....

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Chem 125 Quiz #3 Clark Kent Dr. Retsek Winter 2008 NAME: __ KEY _____________________________ (10 points, 2 points each) For each of the following, circle the best answer. There is only one correct answer for each question. 1. Which one of the following will give a solution with a pH > 7, but is not an Arrhenius base in the strict sense? We want a base, but not an Arrhenius base (no OH - in formula) a. CH 3 NH 2 Base not Arrhenius base b. NaOH Arrhenius base c. CO 2 Lewis acid d. Ca(OH) 2 Arrhenius base e. CH 4 nothing 2. Which of the following contains the strongest acid? pK a = - logK a therefore K a = 10 -pKa so the smaller the pK a the larger the Ka 0.1 M HA, pK a = 2.85 0.1 M HD, pK a = 3.22 0.1 M HE, pK a = 4.34 0.1 M HJ, pK a = 5.88 pure water a. HA b. HD c. HE d. HJ e. pure water 3. Which of the following is the conjugate acid of HS 1- ? HS 1- is the base, so the conjugate acid has one more H + a. HS 2 b. S 2- c. HS 1- d. H 2 S e. SOH 4. Which of the following is a Lewis acid? Lewis acid is an electron pair acceptor (so
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Quiz3A_key - Chem 125 Winter 2008 Quiz #3 Clark Kent Dr....

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