A solution of `Ni(NO_3)_2` is electrolysed between platinum electrodes using a current of 5 amperes for 20 minutes. What mass of nickel is deposited at the cathode?[molar mass of Ni `= 58.7gma " mol"^(-1)`]

Explanation

Given
Current = 5A
Time `= 20 xx 60 = 1200 s `
Charge = current ` xx ` time
` = 5 xx 1200`
` = 6000 c `
According to the raction ,
`Na_((aq))^(2+) + 2e^(-) to Ni_((s))`
Nickel deposited by ` 2 xx 96487 c = 58.71 g `
Therefore , nickel deposited by 6000 c `=(58 . 71 xx 6000) // (2 xx 96487)g`
` = 1.825 g `