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A solution of Ni(NO_3)_2 is electrolysed between platinum electrodes using a current of 0.5 ampere for 20 minutes. What mass of Ni is deposited at the cathode ? |
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Answer» Solution :Quantity of electricity passed `=(5A) xx (20 xx 60 s) = 6000 C` `Ni^(2+) + 2e^(-) to Ni` Thus, 2F, i.e. `2 xx 96500 C` will DEPOSIT = 1mole, i.e. 58.7 g of Ni `therefore 6000 C` will deposit `=58.7/(2 xx 96500 ) xx 6000 g = 1.825 g` of Ni. |
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