Harry_-

The aim of the experiment is to look into the effect of change of concentration of electrolyte on cell voltage. This is to help me test the nernst equation. The document was written by me and I have no hope of recording to such precise values however I do want at least milivolts. I understand my values will not be completely correct, the point is to test the equation, not get exact values. I have been given an electrometer by the university. With resolution 100 micro volts and going up to 2V I should be able to obtain values from this.

OK so after talking through with a few teachers we believe a potential divider won't work and the reasoning is this: Say we had 1000:1 . Our 1000 ohm would give 1.0044 V and our 1 ohm would read 0.0010044 and therefor we would never be able to read that on my equipment. Potentiometric voltmeters require precise resistors whereas the ones I have available have 10% error. As for circuit theory I have looked into potential dividers and resistors in series and parallel but not much else. My plan for now is to try and talk to the local university and see if they have any equipment I could use or get lab time. If you think of any other possible options, I will be here. Thanks

Thanks for your response, A potential divider is probably my best bet. My multimeter can go down to a 10th of a milivolt. Should I use a resister setup of 1000:1 or of 10000:1? The Nernst equation is not on the A-level specification, it is my own work. Thanks for your help!

Hi, I am a secondary school student from England looking into advanced chemistry. I have been learning about the nernst equation and am planning an experiment on this topic. I need to measure a change of 0.001 volts (a milivolt) with a starting voltage of 1V. How can I do this, my school has a multi-meter however its milivolt reader only has 3 significant figures (up to 99.9 mV). At 1.001 volts I would need up to 9999 mV. Find attached proposed experiment Thanks Nernst equation experiment.docx