Chemical Forums

Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: p_[hem boy on June 25, 2009, 07:36:33 PM

Title: electromotive force question stuck on
Post by: p_[hem boy on June 25, 2009, 07:36:33 PM

hello, im stuck on a galvanic cell electromotive force problem.
given at 298K, and assume activity coefficients of all species are 1

Ag(s)| AgCl(s)| KCl (aq, .025 mol/L)|| AgNO3 (aq,0.010 mol/L) | Ag (s)

i got from the table .799 for AgNO3 +1 -> Ag(s) 0, and also got .2223 from table (IM ASSUMING) for the KCL-> AgCl (s) and Ag (s) but not sure if that number is right.

also i know those given values or for 1 mol equiv. but mine a mol fractions.   so im assuming again its not as easy as subtracting     .799-.2223

not sure where to go.   prof told me i cant simply multiply the .010mol/L by the given values...so not sure what to do

much thanks for any help

Title: Re: electromotive force question stuck on
Post by: plankk on June 26, 2009, 02:58:42 AM

You should use the Nernst equation.