00:01
Hi student, here firstly we find limiting current for reduction of the fe3 plus and formula is limit is equal to mfa mc that is m into f into a into m into c.
00:24
So, m is here number of electron transfer interaction, f is faraday's constant, then a is surface area that is electrode area, m is the mass transfer coefficient and c is the concentration of fe3 plus and i limit means it is the limiting current.
01:26
Now we put the value in this formula that is i limit is equal to 1 value of n that is number of electron transfer is 1 into value of f is 96485 into 0 .3 into 10 raise to minus 2 into 20 into 10 raise to minus 3 and by calculation we get the limiting current is equal to 5 .7887.
02:05
Now we sketch the i curve, now we consider reduction potential of both fe3 plus and sn4 plus r and here the standard reduction potential that is fe3 plus plus electron which gives fe2 plus and standard reduction potential is plus 0 .77 volt, then sn4 plus plus 2 electron gives sn2 plus and standard reduction potential for this reaction is plus 0 .15 volt.
02:44
So, naysen equation is e is equal to e0 minus rdnf ln of q.
02:52
So, e is reduction potential at given condition, r is gas constant, t is temperature and q is the reaction weight...