Nernst Equation


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Philip
Posts: 100
Joined: Sat Sep 07, 2019 12:16 am

Nernst Equation

Postby Philip » Sat Mar 14, 2020 2:47 pm

Do we need to convert RT/nF * lnQ into 0.0592/n log Q?

Because I decided not to convert during one of the problems on the test as I forgot the conversion rate and I got the wrong answer even when I think my calculations were right. So is it necessary to use this conversion?

Philip
Posts: 100
Joined: Sat Sep 07, 2019 12:16 am

Re: Nernst Equation

Postby Philip » Sat Mar 14, 2020 2:48 pm

Also what R are we using?

DanielTalebzadehShoushtari2A
Posts: 53
Joined: Fri Aug 02, 2019 12:16 am

Re: Nernst Equation

Postby DanielTalebzadehShoushtari2A » Sat Mar 14, 2020 2:51 pm

No, it is not necessary. Just make sure that the values you use for each variable are in the right units, and if they are not, convert them individually. T should be in Kelvin. R should be in the J/K form. F is the faraday constant in C/mol, and n is in mol. lnQ is unitless. Altogether, the term should come to be in units J/C, which is volts.

Julia Holsinger_1A
Posts: 50
Joined: Tue Feb 26, 2019 12:16 am

Re: Nernst Equation

Postby Julia Holsinger_1A » Sat Mar 14, 2020 4:07 pm

I convert RT/F to 0.025693 V and it has always given me the correct answer when I plug it in. I think you need to be careful of how you round if you are calculating RT/nF

Lauren Tanaka 1A
Posts: 109
Joined: Sat Aug 17, 2019 12:18 am

Re: Nernst Equation

Postby Lauren Tanaka 1A » Sat Mar 14, 2020 6:17 pm

You don't need to convert but Dr. Lavelle said in lecture that the conversion can be useful in biological situations since it makes it easier to calculate pH.

Indy Bui 1l
Posts: 99
Joined: Sat Sep 07, 2019 12:19 am

Re: Nernst Equation

Postby Indy Bui 1l » Sat Mar 14, 2020 6:20 pm

No it is not necessary. Just make sure you plug in the correct values for R, F, and T. For R you should usually be using the 8.314J/K*mol.

Ashley Alvarado 2C
Posts: 45
Joined: Sat Aug 17, 2019 12:16 am

Re: Nernst Equation

Postby Ashley Alvarado 2C » Sat Mar 14, 2020 8:45 pm

That conversion is useful when the system is at room temperature.


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