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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: bobby-_2312313123 on April 27, 2021, 10:49:32 PM

Title: I am confused on this Nernst question
Post by: bobby-_2312313123 on April 27, 2021, 10:49:32 PM

In a mixture solution of 0.05 mol L-1 NiCl2, 0.05 mol L-1 ZnCl2, and 0.5 mol L-1
HBO3 at pH 3.5, use Nernst equation to work out the potential window, in which a
thin film of pure nickel can be electrodeposited onto the steel substrate from this
mixture solution at 25 oC, and show the steps of your calculations. (The standard
reduction electrode potentials for redox couples Ni2+/Ni and Zn2+/Zn are -0.250 V
and -0.763 V vs Standard Hydrogen Electrode (SHE), respectively. R = 8.314 J (mol
K)-1, F = 96500 C mol-1).

I have so far managed to determine the overall chemical potential but don't know how to do the rest.

Title: Re: I am confused on this Nernst question
Post by: Borek on April 28, 2021, 02:49:33 AM

Start by determining what things that can be reduced are present in the solution and what potentials they need for the reduction. These potentials will overlap.