Redox And Electrochemistry Worksheet With Answer Key Page 4
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8#7
A galvanic cell is constructed using a chromium electrode in a 1.00-molar solution of
Cr(NO
)
and a copper electrode in a 1.00-molar solution of Cu(NO
)
. Both solutions
3
3
3
2
are at 25˚C.
(a) Write a balanced net ionic equation for the spontaneous reaction that occurs as the cell
operates. Identify the oxidizing agent and the reducing agent.
(b) A partial diagram of the cell is shown below.
Cu
Cr
1.0 M Cu(NO )
1.0 M Cr(NO )
3 3
3 3
(i)
Which metal is the cathode?
(ii) What additional component is necessary to make the cell operate?
(iii) What function does the component in (ii) serve?
(c) How does the potential of this cell change if the concentration of Cr(NO
)
is changed
3
3
to 3.00-molar at 25˚C? Explain.
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