Lab 14 - Lab 14: Thermodynamics of Electrochemical Cells...

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Lab 14: Thermodynamics of Electrochemical Cells Introduction: In this lab we will study the effects of temperature and concentration of cell potentials using the Nernst equation; this will be done by constructing electrochemical cells. Pre-lab: Attached Data: Pb+ Cu 2+ -> Cu + Pb 2+ Temperature (C) E 0 cell Delta G O K 7.5 0.508 V -98028.76 1.84* 10 18 16 0.509 V -98221.73 5.78*10 17 20.5 0.511 V -98607.67 3.62 *10 17 45 0.514 V -99186.58 5.00*10 17 71 0.524 V -101116.3 2.30*10 15 Experimental Values (298 K, from plot) Calculated Values (298 K) Delta G o -98597.5 3 Delta G o -89000 Delta H o -97.82 Delta H o -66.47 Delta S o 31.021 Delta S o 78.44 K 1.96*10 17 K 4.06*10 15 Pb+ Cu 2+ -> Cu + Pb 2+
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Concentration E cell Measured Calculated Temperature (C) 1.0 M Pb(NO 3 ) 2 1.0 M Cu(NO 3 ) 2 0.511 0.511 20.5 0.1 M Pb(NO 3 ) 2 1.0 M Cu(NO 3 ) 2 0.545 0.530 73.5 1.0 M Pb(NO 3 ) 2 0.1 M Cu(NO 3 ) 2 0.478 0.463 67.5 Discussion: The overall purpose of this lab was to determine delta G, H, and S by measuring the cell voltage of the cell reaction Pb+ Cu
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Lab 14 - Lab 14: Thermodynamics of Electrochemical Cells...

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