Question

Write the Nernst equation and ecell and calculate the emf of the following cell at 298 K.

Cu (s) / Cu++ ( 0.130 M) // Ag+ ( 1.0× 10-4 M) / Ag (s) given : E Cu++ / Cu = 0.34V and E Ag+/Ag = 0.80V​

Answer 1

Mg(s) +Cu2+(aq)? Mg2+(aq) + Cu(s)

Nernst equation

http://ncerthelp.com/scienceimg/12-CH3/03.jpg

There are two electron are transferring so that n = 2

E�cell = E� right� � E�left

E�cell =+0.34 � (�2.37)V

E�cell =+2.71V

Plug the value we get

Concentration of solid substance is 1 always so that [Mg] = [Cu] =1