A reduction of 150 mL of aqueous Cr3+ to Cr2+ is carried out by constant
current
electrolysis. To ensure that the electrolysis is complete and that no
other species was
reduced, the current was reduced each time the potential of the cell
reached -0.528 volts.
Cell: Pt/H2(1 atm)/H+(aq)(1.0 M)/Cr3+(aq)(??? M)/Pt
(initial concentrations are given)
The current values and the time that current level was used is shown in
the table below.
Current (mA) Time (min)
100 26.75
20 7.08
3 1.83
a) How much Cr3+ was reduced to Cr2+?
b) A few seconds after the electrolysis was stopped, the potential of
the cell came to rest
at -0.524 volts. How much Cr3+ actually remains in the solution?
c) What was the original Cr3+ concentration?
Chemistry Homework Solutions
#13012
Reduction through constant current electrolysis
Reduction through constant current electrolysis a) How much Cr3+ was reduced to Cr2+? b) A few seconds after the electrolysis was stopped, the potential of the cell came to rest at -0.524 volts. How much Cr3+ actually remains in the solution? c) What was the original Cr3+ concentration?
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