Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Nitin_Naudiyal on December 06, 2012, 05:38:42 AM
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E0Cu2+|Cu = 0.24 V
E0Ni2+|Ni = -0.257 V
In my college Textbook its written that Ni Spatula will displace Cu from CuSO4
How does one determine that Ni displaces Cu from its solution.
Is it that Ni has a lower ( Negative) reduction potential than Cu hence it displaces it.
Or is it that a compound with lower Reduction potential displaces the other with higher Potential?
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Is it that Ni has a lower ( Negative) reduction potential than Cu hence it displaces it.
Or is it that a compound with lower Reduction potential displaces the other with higher Potential?
Somehow I fail to see the difference.
If you ask whether it matters if the potential is negative - it doesn't. What matters is that one potential is lower than the other.
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Somehow I fail to see the difference.
If you ask whether it matters if the potential is negative - it doesn't. What matters is that one potential is lower than the other.
So, if one potential is lower than the other, the element with the lower potential will displace the compound with the higher potential.
Is is correct?
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Generally speaking - yes.
Note that in water you always have some H+, so elements with negative potentials can displace it producing H2. It is also possible that given element is passivated with oxides, which make it nonreactive, even if the potential suggests otherwise.
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E0Ag = 0.8V, E0Cl2 = 1.36V.
So, is Oxidation of Ag is possible by Cl2?
As the Standard Potential of Cl2 is greater than that of Ag, Cl2 can oxidize Ag.
i.e. Ag can reduce Cl2
Is it correct?
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Yes.
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Thank You