Exam 2 Practice - Resource Page Periodic Table of the...

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Resource Page Periodic Table of the Elements Compound K sp Ca(OH) 2 5.5E-6 CuS 1.3E-36 Mg(OH) 2 1.1E-11 MnS 1.3E-15 Ni(OH) 2 5.6-18 Selected K sp values Reaction Reduction potential (V) MnO 4 - , 8H + /Mn 2+ , H 2 O (l) +1.51 Cl 2 /Cl - +1.36 Zn 2+ /Zn -0.76 Cr 2+ /Cr -0.91 Standard reduction potentials Useful equations: Henderson-Hasselbalch: pH = pK a - log([acid]/[base]) For a diluted weak acid, x 3 - K a x 2 - (K w + K a [HA] initial )x – K w K a = 0; x = [H + ] if production of OH - and H 3 O + by water is taken into account In an electrochemical cell: lnK = nFE°/RT; RT/F = 0.025693 V K a1 (H 2 S) = 1.3E-07 K a2 (H 2 S) = 7.1E-15 K a (HClO) = 3.0E-8
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Chemistry 204 Practice Exam - 30 minutes 1. A large volume of 0.250 M H 2 S (aq) is treated with a strong base to adjust the pH to 6.90. Assume that addition of base does not significantly affect the volume of the solution, estimate then concentration of H 2 S, HS - , and S 2- present in final solution.
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This note was uploaded on 11/19/2010 for the course CHEM 204 taught by Professor Gruebele during the Spring '08 term at University of Illinois, Urbana Champaign.

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Exam 2 Practice - Resource Page Periodic Table of the...

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