230_F09_E3_Wkst1_blank - CHEM 230 F09 E3 Worksheet 1 1 1)...

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CHEM 230 F09 E3 Worksheet 1 1 1) Ca(OH) 2 has K sp ~ 1x10 -6 . If 0.1 mol of Ca(OH) 2 was added to 1 L of pure water, what would be the approximate pH of the resulting solution? A) 2 B) 8 C) 12 D) 13 E) None of the above 2) Phenolphthalein is an acid-base indicator that is colorless in its acid form and pink in its basic form, changing at pH = 8.5. Bromcresol green is yellow in its acidic form and blue in its basic form, changing at pH = 4.8. A solution is colorless in phenolphthalein and blue in bromcresol green. Therefore we can conclude that the pH of the solution is __________. A) exactly 7.0 B) greater than 8. C) between 7.0 and 8.5 D) between 4.8 and 8.5 E) less than 4.8 3) A weak base with pK a = 10 is titrated with a strong acid. At what pH will the stoichiometric point occur? A) Less than 7 B) Exactly 7 C) Greater than 7 4) Which characteristic of an electrochemical cell is affected by the number of electrons that appears while balancing a redox reaction? A) the voltage B) the current C) the work = -nF Δ E D) B & C E) all of the above F) none of the above 5) Iron is oxidized from Fe 2+ to Fe 3+ by MnO 4 -2 in aqueous acid solution. When the reaction Fe 2+ (aq) + MnO 4 1- (aq) Fe 3+ (aq) + Mn 2+ (aq) is balanced in acid, what is the coefficient of H 2 O? A) 1 B) 2 C) 3 D) 4 E) 5
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CHEM 230 F09 E3 Worksheet 1 2 6) Which of the following is the strongest reducing agent? (You may want to check out a Table of Standard Reduction Potentials.) A) K (s) B) Cr 2+ (aq) C) H 2(g) D) Fe 2+ (aq) 7) How long would it take to plate 4.53 g of nickel onto an electrode from a solution of NiCl 2 at a current of 12.34 amps?
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This note was uploaded on 03/29/2010 for the course CHEMISTRY 230 taught by Professor Gottfried during the Fall '10 term at University of Michigan.

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230_F09_E3_Wkst1_blank - CHEM 230 F09 E3 Worksheet 1 1 1)...

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