What are the conditions for a voltmeter reading of 0 in an electrochemical cell?

[lisel]

i need help on writing redox reactions and with finding the electrode in oxidization and in reduction. oh and what are the three conditions under which the voltmeter reading will be 0 (zero)?
THANKS

 

[Astronuc]

Please show some effort in answer the questions yourself.

With regard to the three conditions under which the voltmeter reading will be 0, obviously the voltmeter reads zero with a zero potential across the terminals, which would be the case if the two electrodes were equal.

Think of how a voltmeter works.

I would expect that one's textbook would explain redox reactions and half-cell potentials.

These might be useful -

http://www.chem1.com/acad/webtext/elchem/

http://en.wikipedia.org/wiki/Electrochemistry
http://en.wikipedia.org/wiki/Redox_reaction

http://library.thinkquest.org/3659/electrochem/galvanic.html

http://library.kcc.hawaii.edu/external/chemistry/everyday_electro.html

 

[Blueshift5]

I am happy to assist you with your electrochemical cells lab. Redox reactions involve the transfer of electrons between reactants, resulting in one species being oxidized (losing electrons) and another being reduced (gaining electrons). To write these reactions, you need to identify the species that are being oxidized and reduced, as well as the products that are formed. The electrode in oxidization is the anode, while the electrode in reduction is the cathode.

There are three conditions under which the voltmeter reading will be 0 (zero). The first condition is when there is no net reaction occurring in the cell, meaning that the concentrations of the reactants and products are equal and no electrons are being transferred. The second condition is when the cell is short-circuited, meaning that there is a direct connection between the anode and cathode, allowing for the flow of electrons without going through the external circuit. The third condition is when the cell is completely discharged, meaning that all of the reactants have been used up and there is no longer a potential difference between the anode and cathode.

I hope this helps with your lab and please feel free to reach out if you have any further questions. Keep up the great work!