LAB 32 - syikin - Experiment 32 : Thermodynamics of...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Experiment 32 : Thermodynamics of Electrochemical Cells Abstract The electromotive force of a cell was measured at different temperature to obtain P T E . P T E was found out to be K Volts 4 10 ) 5 . 0 4 . 1 ( - × ± - . From that number, other thermodynamics properties at 25°C were calculated. ∆G was calculated to be -308270 ± 150 mol Joule . ∆S was found out to be -26.8 ± 10.3 Kelvin mol Joule . ∆H was 316000 ± 3000 mol Joule . From the above numbers, irreversible heat and reversible heat was calculated to be -316000 ± 3000 mol Joule and -8000 ± 3000 mol Joule respectively. Introduction The objective of this experiment is to determine ∆G, ∆H and ∆S in a cell reaction. A reaction needs to be carried out reversibly in a cell and the measurement of reversible cell potential with respect to temperature needs to be done in order to determine ∆G, ∆H and ∆S. In this experiment, the following reaction was carried out in a cell: Zn(s) + Ag 2 O(s) ZnO(s) + 2 Ag(s) The cell potential was determined at different temperature (25 o C, 35 o C and 45 o C) to get P T E . The voltmeter needs to be calibrated for offset error and gain error. The corrected values was then used to get the thermodynamic properties.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Data and Calculations Calibration : Calculation of offset error and gain error Calibration Readings Offset (V) 0.0001 V observed (V) 1.0188 V true (V) 1.01927 Gain 0.99944 Table 1
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/27/2008 for the course CHEM 563 taught by Professor Woods during the Spring '08 term at University of Wisconsin.

Page1 / 8

LAB 32 - syikin - Experiment 32 : Thermodynamics of...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online