230_F09_E3_Wksht2_blank - CHEM 230 F09 Exam 3 Worksheet 2 1...

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CHEM 230 F09 Exam 3 Worksheet 2 1 1) Citric acid (H 3 C 6 H 5 O 7 ) is a triprotic acid with pK a1 = 3, pK a2 = 4, and pK a3 = 6.5. What is the approximate pH of a 0.01 mol/L solution of H 3 C 6 H 5 O 7 ? ( No math needed.) A) 2.5 B) 3 C) 4 D) 4.5 2) In a titration of a weak acid (pK a = 4) with a strong base, what would the pH of the stoichiometric point be? A) less than 7 B) exactly 7 C) greater than 7 3) Mg(OH) 2 has K sp = 1x10 -12 . If 0.1 mol Mg(OH) 2 was added to 1 L of water, what would the pH of the water be, assuming the water was initially pH 7? A) 8.7 B) 9.8 C) 10.1 D) 13.0 E) 13.3 4) The current of an electrochemical cell is determined by what? ( Consider the power equation .) A) The power of an attached device B) The standard cell potential C) The reaction quotient D) All of the above E) None of the above 5) Is HClO 4 most likely to be an oxidizing agent or a reducing agent? (Hint, take a look at the oxidation number of Cl) A) Oxidizing agent B) Reducing agent C) Both D) Neither 6) Calculate the equilibrium constant for the following reaction at 25.0 o C: (Use a table of standard reduction potentials) Hg 2 2+ + 2 Fe 3+ 2 Hg 2+ + 2 Fe 2+ A) 11.7 B) 8.42x10 -6 C) 1.19 x10 5 D) -0.15
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CHEM 230 F09 Exam 3 Worksheet 2 2 7) During a first order reaction, a reactant decreases from 1 M to 0.5 M in time T 1 . The same reaction then decreases from 0.5 M to 0.25 M in time T 2 . Is T 1 longer, shorter, or the same as T 2 ? A)
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230_F09_E3_Wksht2_blank - CHEM 230 F09 Exam 3 Worksheet 2 1...

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