Copy of Chem152_Electro_Report_092511

Copy of Chem152_Electro_Report_092511 - Name: Michelle Bang...

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Page 1 of 1 Name: Michelle Bang Quiz Section: AG ID Number: 1021913 Lab Partner: Tessa Barclay Total Points = 60 (5 notebook, 55 template) Standard Potentials vs. Silver/Silver Chloride Reference Electrode Cell Number Potential, V Cathode Anode vs. Ag/AgCl Electrode Electrode (spontaneous rxn) 1 (Ag) 0.569 Ag AgCl 2 (Zn) 0.76 AgCl Zn 3 (Pb) 0.36 AgCl Pb 4 (Cu) 0.109 Cu AgCl 8 pts Spontaneous Reaction (between each half cel and Ag/AgCl reference) Cel # 1 2 3 4 6 pts Actual value of your measurement (V) 0.4 0.38 Cell/Line Notation for battery with voltage greater than +1.7V 4 pts Measured Voltage: 1.711 Copper Concentration Cell (half cells #4 and #5) 5 pts Potential, V Expected Potential, V Write out the spontaneous reaction: Measured Calculated (not cel /line notation) 0.16 0.030 Cell/Line notation for cell that should give exactly 0.5V Actual value of your measurement (V) 0.469 4 pts Zinc (#2) and Lead (#3) E cel , V Expected E cel (V) based on YOUR E o values Pb(s) + Cu2+(aq) → Pb2+(aq) + Cu(s) Chem 152 Experiment #5: Electrochemistry Part I:  Standard Potentials Part II:  Batteries Type the calculations used to determine how to prepare the concentration cel : = - . / × ( ) E_cell Eᵒ_cell 0 0591 V n log Q . = . - . / × 0 50 0 469 V 0 0591 V 2 log 〖 ( ) Q 〖 - . = ( ), = . = ([ ^(+ )])/([ ^(+ )]) 1 049 log Q where Q 0 089 Pb 2 Cu 2 [ 〖 Cu 〖 ^(+ )] . [ ^(+ ) ] . . _ 2 kept at 1 0 M therefore Pb 2 changes from 1 0 M to 0 089 M ( . )×( )=(. )×( ) 1 0M x ml 089 M 10 ml = . = . x 0 89 mL amount of 1 0 M 〖 Pb 〖 ^(+ ) 2 to be diluted to 10 mL Type the calculation of of the expected potential based on your measured E o values: Eᵒ_cell= Eᵒ_cathode (Zn) - Eᵒ_anode (Pb) Eᵒ_cell= 0.76 V - 0.36 V Eᵒ_cell= 0.40 V Type the calculation for the expected cel potential: = - . / × ( ) E_cell E ᵒ_cell 0 0591 V n log Q = - . / × ( . / . ) E_cell 0 0 0591 V 2 log 0 1 1 0 = . E_cell 0 02955 V Purpose and Method                     The first goal is to measure the standard reduction potentials of Ag/Ag
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This note was uploaded on 02/03/2012 for the course CHEM 152 taught by Professor Chiu during the Fall '08 term at University of Washington.

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