1. An electrochemical cell is based on the following twohalf-reactions:
Ox: Pb(s)→Pb2+(aq, 0.18 M )+2e−
Red: MnO−4(aq, 1.50 M )+4H+(aq,1.8 M )+3e−→
MnO2(s)+2H2O(l) Compute the cell potential at 25∘C.
2.A concentration cell consists of two Sn/Sn2+ half-cells. Thecell has a potential of 0.16 V at 25 ∘C.
What is the ratio of the Sn2+ concentrations in the twohalf-cells?
Express your answer using two significant figures.
3.Metal plating is done by passing current through a metalsolution. For example, an item can become gold plated by attachingthe item to a power source and submerging it into a Au3+ solution.The item itself serves as the cathode, at which the Au3+ions arereduced to Au(s). A piece of solid goldis used as the anode and is also connected to the power source,thus completing the circuit.
What mass of gold is produced when 8.80 A of current are passedthrough a gold solution for 18.0 min ?
Express your answer with the appropriate units.
