Stoichiometry of Cells

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Presentation transcript:

Stoichiometry of Cells Faraday’s Law

Stoichiometry of Electrolytic Cells The mass deposited or eroded from an electrode depends: on the quantity of Charge Q that passes through the cell. Q is the product of current in amps times time in seconds Q = It time in seconds Charge in coulombs current in amperes (amp)

What is a coulomb? A coulomb (unit for quantity of of charge) is the amount electricity that passes a given point in a circuit when a current of one ampere (A) flows for one second. Charge (C) = current (A) * time (s) 1 amp = 1 coulomb/second Example: Calculate the quantity charge that passes through one 300kA cell in a 24 hour period.

Calculate the charge that passes through one 300kA cell in a 24 hour period. Q = It = (300kA x 1000A/kA)(24 h x 3600s/h) = (300000C/s )(86400s) = 2.6 x 1010C

What is Faraday’s Law Faraday determined the relationship between moles of electrons that exchange in a redox reaction and the quantity of charge. He came up with a constant: the Faraday (F) 1 F equals 96,487 coulombs=1 mole of electrons

Counting Electrons: Coulometry and Faraday’s Law of Electrolysis The moles of material consumed or produced in a reaction can be calculated from the stoichiometry of a reaction: the current and time: ne- =It/F

A metallic object to be plated with copper is placed in a solution of CuSO4. What mass of copper will be deposited if a current of 0.22 amp flows through the cell for 1.5 hours?

Calculate the mass of palladium produced by the reduction of palladium (II) ions during the passage of 3.20 amperes of current through a solution of palladium (II) sulfate for 30.0 minutes.

Calculate the mass of palladium produced by the reduction of palladium (II) ions during the passage of 3.20 amperes of current through a solution of palladium (II) sulfate for 30.0 minutes.