Chemical Forums

Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: vernii on January 19, 2023, 06:28:08 AM

Title: Electrochemistry
Post by: vernii on January 19, 2023, 06:28:08 AM

Why does the voltage decreases as the electrochemical cell works and the concentration of ions begins to change both the sides ?

Title: Re: Electrochemistry
Post by: Hunter2 on January 19, 2023, 09:39:20 AM

Do you know the Nernst equation for chemical cell?

Title: Re: Electrochemistry
Post by: vernii on January 21, 2023, 04:36:52 AM

I know the answer based on the equation but what is the basis of the equation ?

Title: Re: Electrochemistry
Post by: Borek on January 21, 2023, 05:38:26 PM

Thermodynamics. System tries to go the equilibrium which is the least energy state. As long as there is potential difference there is an energy available. If you try to use thermodynamics to mathematically describe the Gibbs energy of the redox system you get the Nernst equation.