Calculate the time that is required to electroplate a 1.0 mm thick silver layer on a...
Calculate the time that is required to electroplate a 1.0 mm thick silver layer on a 2.0 × 2.0 cm2 surface when a current of 1.0 A is allowed to pass through the electrolyte.
Homework Answers
Density of silver is 10.5 g/cm3.
First calculate the area which is electroplate by silver
Thickness = 1.0 mm= 0.1 cm
Volume = thickness * area
= 2.0 × 2.0 cm2 × 0.1 cm
= 0.4 cm^3
Density = mass / volume
Mass = density * volume
= 10.5 g/cm3 *0.4 cm^3
= 4.2 g
Applying to silver E = Z × 96500
Z = 108/96500 g
Let the current be passed for t seconds.
We know that
W = Z × I × t
So, 4.2 = 108/96500 x 1.0 x t
or t = (4.2 × 96500)/(108×1.0)
=3752.77 second
= 62.55 min
= 1.04 hr
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