If a piece of copper metal is dipped into a solution containing Cr3+ ions, what will happen? Explain with Ev values

Answer 1

Nothing happens.
Cr^3+ + 3e ==> -0.74v
Cu ==> Cu^2+ + 2e -0.337
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2Cr^3+ + 3Cu ==> 3Cu^2+ + 2Cr E = -1.077v
The voltage is negative, hence the reaction, as written, will not occur. It will occur in the reverse direction.

Answer 2

DrBob... Could you explain how you got negative...I thought E = reduced - oxidized E = 0.34 V - (-0.74 V) = 1.08 V

Answer 3

YOU JUST HAVE TO FOLLOW THE RULES & ABIDE WITH IT