A zinc bar weighing 3.0 kg is attached to a buried iron pipe to protect the pipe

Question

A zinc bar weighing 3.0 kg is attached to a buried iron pipe to protect the pipe from corrosion. An average current of 0.020 A fows between the bar and the pipe. How many years will be required for the zinc bar to be entirely consumed? (1 year = 3.16 x 10^7 s) A zinc bar weighing 3.0 kg is attached to a buried iron pipe to protect the pipe from corrosion. An average current of 0.020 A fows between the bar and the pipe. How many years will be required for the zinc bar to be entirely consumed? (1 year = 3.16 x 10^7 s) A zinc bar weighing 3.0 kg is attached to a buried iron pipe to protect the pipe from corrosion. An average current of 0.020 A fows between the bar and the pipe. How many years will be required for the zinc bar to be entirely consumed? (1 year = 3.16 x 10^7 s)

Explanation / Answer

According to Faraday's first law of electrolysis,

W = M c t / Z F

t = W Z F / M c

t = 3.0 * 1000 * 2 * 96500 / (65.38*0.020)

t = 442999235 s

t = 14.0 years

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