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When I increased the temperature of my volataic cell using a waterbath my voltage output increased

ChairNoBill
in Science Education

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I used Fe and Zn as electrodes, 40 ml of 0.1 molar ZnSO4 and 40ml of 0.1 molar FeSO4 as electrolytes. As saltbridge I used KCl. I did not change anything during my experiment meaning that I did not switch the electrolytes after trials. I can't explain why voltage increased, does anyone have an idea why this could have been the case? 

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https://www.scienceforums.net/topic/123960-when-i-increased-the-temperature-of-my-volataic-cell-using-a-waterbath-my-voltage-output-increased/
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