Textbook Problem

Arrhenius Equation:

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Yeyang Zu 2J
Posts: 58
Joined: Fri Sep 29, 2017 7:06 am

Textbook Problem

Postby Yeyang Zu 2J » Fri Feb 23, 2018 12:40 am

The textbook writes that (RT/F) ln 10 = (0.026 93 V) * 2.303 = 0.0592 V at 25 C,
Ecell =Ecell'- (ET/F)ln10*og{H+} =Ecell'+ .0592 V* pH
It is on the page 591, which is section 14.11

why equation changes the sign from "plus" to "minus" if (RT/F) ln 10 = (0.026 93 V) * 2.303 = 0.0592 V

Deap Bhandal L1 S1J
Posts: 77
Joined: Fri Sep 29, 2017 7:05 am
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Re: Textbook Problem

Postby Deap Bhandal L1 S1J » Fri Feb 23, 2018 12:35 pm

That negative sign changes to plus since pH is the -log[H+]. When they changed log[H+] to pH they had to multiply it by -1. Hope this makes sense!

Emma Miltenberger 2I
Posts: 51
Joined: Thu Jul 27, 2017 3:00 am

Re: Textbook Problem

Postby Emma Miltenberger 2I » Fri Feb 23, 2018 1:01 pm

The sign changes because pH is equal to -log[H+]. Therefore, when converting, you must account for this negative sign in front of the log.


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