standard electrodes


by ajayguhan
Tags: battery, cell, electricty, potential, pressure
ajayguhan
ajayguhan is offline
#1
Sep15-13, 09:52 AM
ajayguhan's Avatar
P: 124
In standard electrodes, why it is necessary to maintain the pressure as 1 atmosphere, is the potential of an half cell depends on pressure too? If yes then how the potential of an half cell depends upon pressure?

Say for example, i know that in standard hydrogen electrodes we maintain the concentration and temperature as 1M and temperature 25C since the potential depends upon temperature and concentration of the electrolyte.but why should we maintain the pressure as and1 atmosphere? If the potential depends upon pressure, how come they are related i didn't get the logic!
Phys.Org News Partner Chemistry news on Phys.org
Space-tested fluid flow concept advances infectious disease diagnoses
New, more versatile version of Geckskin: Gecko-like adhesives now useful for real world surfaces
Researcher develops novel wastewater treatment fabric
Borek
Borek is offline
#2
Sep15-13, 02:17 PM
Admin
Borek's Avatar
P: 22,679
Note that the concentration of the dissolved gaseous hydrogen is directly proportional to the pressure of the gas over the solution (even heard about Henry's law?). But dealing with the concentration is inconvenient, it is easier to express the gas presence using its pressure. And just like we assume 1M solution is the standard state for an ion, we assume 1 atm is a standard state for the gas.


Register to reply

Related Discussions
Need help with electrochemistry lab Biology, Chemistry & Other Homework 6
Electrochemistry - HW Biology, Chemistry & Other Homework 0
Electrochemistry Lab Biology, Chemistry & Other Homework 8
research on electrochemistry Chemistry 9
piece of Ag is placed in 1.0M NiCl2 Chemistry 2