Exp_10Electrochem - Chem 12 Exp#10 Electrochemistry...

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Chem 12 Exp #10 Electrochemistry Laboratory Pre-laboratory Assignment 1. Review in Zumdahl, Section 11.1 Galvanic Cells , pages 462-465 and Section 11.5 Batteries , pages 481-486. 2. Calculate how many grams of FeSO 4 . 7 H 2 O (MW = 278.02 g/mol) will be needed to prepare 5 mL of a 1 M FeSO 4 solution? Voltmeter and Battery Check Determine that the voltmeter is working properly. Connect the voltmeter to a 9 V battery as shown in Figure 1. Set the voltmeter to read volts (not Ohms), DC (not AC) and set the range to read Volts (not mVolts). Record the voltage. Figure 1 Voltmeter and Battery Check 9.00 V voltmeter + _ battery Part A Determination of the Standard Reduction Potential and the Equilibrium Constant Cu 2+ (aq) + Zn (s) ----------> Cu (s)+ Zn 2+ (aq) E o cell = ? Cu 2+ (aq) + 2 e - ----------> Cu (s) E o red = 0.34 V Zn 2+ (aq) + 2 e - ----------> Zn (s) E o red = ? Assemble a small-scale electrochemical cell. The voltage (potential) which will be recorded from the voltmeter is the electrochemical cell voltage. This voltage is made up of two half-cells joined together by wires and a salt bridge. Assemble the electrochemical cell as shown in Figure A1 and record the data in Table 1. Figure A1 Electrochemical Cell (1 M solutions at 298 K) CuSO 4 ZnSO 4 KCl MgSO 4 FeSO 4 voltmeter solution solution solution Zn (s) Cu (s) (salt bridge) solution solution
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2 A plastic dish divided into four quadrants will be used as the electrochemical cell for this experiment. (Place a piece of white paper labeled with each salt solution under the cell, as shown in Figure A1.) Prepare 5 ml of a 1 M FeSO 4 solution. Add approximately 4 mL of the appropriate salt solution into each quadrant of the cell. A strip of filter paper will be used as a salt bridge. Place the salt bridge saturated with 1 M KCl solution between the appropriate salt solutions. Attach a piece of copper metal [Cu (s)] to the red wire on the voltmeter and a piece of
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This note was uploaded on 02/10/2009 for the course CHEM 12 taught by Professor Dewald during the Spring '08 term at Tufts.

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Exp_10Electrochem - Chem 12 Exp#10 Electrochemistry...

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