16 - AP Chemistry Lab Electrolysis, the Faraday, and...

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AP Chemistry Lab Brockport High School NY USA Electrolysis, the Faraday, and Avogadro’s Number Mr Keefer Introduction The passage of an electric current through a solution is accompanied by chemical reactions at the electrodes. Oxidation occurs at the anode; reduction occurs at the cathode. The amount of reaction that occurs at the electrodes is directly proportional to the number of electrons transferred. Thus, a Faraday is defined as the total charge carried by Avogadro’s number of electrons, or 1 mole of electrons. In this experiment you will determine the value of the Faraday number F by measuring the amount of charge required to reduce 1 mole of H + ions according to the reaction 2H + (aq) + 2e - H 2(g) or H + (aq) + 1e - 2 H 2(g) Electric charge (q) is conveniently measured in Coulombs. A coulomb (C) is the amount of electrical charge that passes a point in a circuit when a current (I) of 1 Ampere flows for one second. Therefore, a Coulomb is an Ampere-Second. The elementary charge on a single electron was discovered by Robert
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16 - AP Chemistry Lab Electrolysis, the Faraday, and...

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