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Question: Answered & Verified by Expert
If 965 coulombs of electricity is passed through a metal cup dipped in silver(I) salt solution, in order to plate it with silver. Then the amount of silver deposited on its surface is
(Given: the molar mass of Ag=108 g mol-1, 1 F=96500 coulombs)
ChemistryElectrochemistryNEET
Options:
  • A 1.08 g
  • B 1.002 g
  • C 108 g
  • D 9.89 g
Solution:
2407 Upvotes Verified Answer
The correct answer is: 1.08 g

The chemical equation for deposition of silver from the salt solution is

Ag+(aq)+e-Ag(s)

Clearly, for deposition of one mole of silver one-mole electrons are required.

  • Charge on one mole of the electron is equal to one Faraday or 96500 Coulombs.
  • The mass of one mole of silver is equal to its molar mass, i.e., 108 g.

Thus, we can say that

96500 coulomb charge can deposit 108 g of silver.

Therefore, 965 coulomb will deposit 10896500×965=1.08 g of silver.

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