Notifications
Clear all
0
13/09/2020 11:54 am
Topic starter
A solution of Ni(NO3)2 is electrolysed between platinum electrodes using a current of 0.5 A for 30 minutes. What weight of Ni will be produced at cathode? (atomic weight of Ni = 58.9 u)
1 Answer
0
13/09/2020 12:07 pm
we know that,
Q = I x t
Given, I = 5.0 A
t = 30 minutes = 30 x 60 = 1800 s
∴ Q = 5 x 1800 = 9000 C
Also, Ni2+(aq) + 2e- →Ni(s)
2 x 96500 C deposits 1 mole i.e. 58.9 g of Ni
∴ 9000 C deposits 58.9/(2 x 96500) x 9000 = 27.5 g of Ni