A-level Chemistry Question/Help - Electrochemical Cells
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In an electrochemical cell, how would a current flow lead to non-standard conditions and give an inaccurate reading for an E cell value? Like what happens if a high resistance voltmeter was NOT used?
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by s.m1In an electrochemical cell, how would a current flow lead to non-standard conditions and give an inaccurate reading for an E cell value? Like what happens if a high resistance voltmeter was NOT used?
To avoid problems in determining the cell E value, it is necessary to use a high resistance voltmeter (usually > 10 MΩ) also called a high impedance volmeter. This keeps the voltage drop across the internal resistance low compared to the open-circuit cell voltage.
The internal resistance of a traditional volmeter causes a voltage drop that can cause inaccuracies, so accuracy will depend on a high resistance voltmeter.
Bye,
Sandro
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