E45ClassQuiz_6 2006

E45ClassQuiz_6 2006 - electrolyte even though a high...

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E45: Quiz 9/20/06 NAME:_______________________________________________________________ 1. Fill in the blank. At the Corrosion Potential (also called the open-circuit potential) of a metal immersed in an aqueous electrolyte, the rate of all oxidation reactions is exactly equal to the rate of all reduction reactions . 2. In the experiment discussed in the last lecture argon gas was bubbled through the electrolyte. What was the purpose of saturating the electrolyte with argon gas? Displace oxygen from the system. 3. This question also relates to the experiment described in the last lecture. In the analysis of the corrosion of iron immersed in 1M HCl, why was chloride not included among the oxidizable or reducible species in the
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Unformatted text preview: electrolyte even though a high concentration of chloride ions was present in the electrolyte? (a) Chloride is surrounded by water molecules (oriented diploes) and is effectively taken out of any electrochemical reactions. (b) The tendency for a chloride ion to hang onto its extra electron is so great that the reaction, Cl--> ½ Cl 2 + e-, can be ignored. (c) In an aqueous solution of 1M HCl, hydrogen ions are always in the immediate vicinity of the chloride ions in order to neutralize each other’s electrical charge. This “bonding” of H + to Cl — in the aqueous solution prevents chloride ions from participating in electrochemical reactions....
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