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Voltage of a Tin-Copper Galvanic Cell as a Function of Temperature

CSEF · 2006 Chemistry

Tadeh Vartanian · Crescenta Valley High School, LaCrescenta

Overview

Objectives/Goals To study the relationship between the voltage output of a tin-copper cell and the temperature of the two solutions. From this, values such as change in entropy and enthalpy can be determined Methods/Materials I first heat up each individual tin(II) chloride and copper(II) chloride solution to a certain temperature. I then pour them into a pourous vase cell with copper and tin plates, salt vase, and electrodes in place. The voltage is measured, and the solutions are dumped out. This is done for various temperatures, and many trials, or cycles, are performed for accurate results. Results A positive correlation exists between temperature and voltage. Changes in enthalpy and entropy are calculated, and they are compared to expected values. Conclusions/Discussion The differences between expected and calculated values are fairly close, and the experiment went fairly well. Sources of error do exist, but overall the results were quite accurate.

Summary statement

What is the relationship between voltage and temperature, and how does this affect electric appliances?

Help received

Father helped with experimentation, revised report, and provided materials; Chemistry teacher provided materials and reference books.

Competition history

  • CSEF 2006 Chemistry · Entry S0522

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