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A solution of Ni(NO_3)_2 is electrolysed between platinum electrodes using acurrent of 5 amperes for 20 minutes. What mass of nickel is deposited at thecathode?[molar mass of Ni = 58.7gma " mol"^(-1)] |
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Answer» Solution :Therefore MASS DEPOSITED by `5 xx 20 xx 60 C = (58.7 xxx 6000)/(2 xx 96500) = 1.84 g` or `W = Zit` `w = (29.35 xx 5 xx 20 xx 60)/(96500) = 1.83 g` RELATION used : Mass of nickel deposited `(W) = (I t E)/(96500) g`. where Current (i)= 5 amperes time (t) = 20 minutes `= 20 xx 60 = 1200 s` Equivalent mass (E) `= ("Molar mass")/("total (+)ve charge") = (58.7)/(2)` `=29.35 g mol^(-1)` or, `W = ("it E")/(96500)` `= (5 xx 1200 xx 29.35)/(96500)` Mass of Nickel deposited = 1.8248 g. |
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