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21/01/2022 5:02 pm
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A solution of Ni(NO3)2 is electrolysed between platinum electrodes using a current of 5 amperes for 20 minutes. What mass of Ni is deposited at the cathode?
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21/01/2022 5:07 pm
Given, Current = 5A
Time = 20 × 60 = 1200 s
∴ Charge = current × time
= 5 × 1200
= 6000 C
According to the reaction,
Ni2+(aq) + 2e- → Ni(s) (58.7 g)
Nickel deposited by 2 × 96487 C = 58.71 g
Therefore, nickel deposited by 6000 C = \(\frac{58.71 \times 6000}{2 \times 96487}\)g
= 1.825 g
Hence, 1.825 g of nickel will be deposited at the cathode.