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Question

A solution of Ni(NO3)2 is electrolysis between plantinum electrodes using a current a current of 5 amperes for 20 minutes. What mass of Ni is deposited at the cathode?

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Solution

Current passed = 5A

Time = 20 × 60 = 1200 s

Charge = current × time

=5×1200=6000C

According to the reaction, Ni2++2eNi

Nickel deposited by 2×96487C=58.71g

Therefore, nickel deposited by 6000C=58.71×60002X96487g

= 1.825 g

Hence, 1.825 g of nickel will be deposited at the cathode.


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