Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry2 Marks
Question
Can copper sulphate solution be stored in an iron vessel ? Explain.
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Answer
Higher the standard reduction potential $(E^\circ )$ value, greater the tendency of the species to accept electrons and undergo reduction.
$Cu^{2+}+2e^-\rightarrow Cu, E^\circ = + 0.337 V ; Fe^{2+} + 2e^- \rightarrow Fe, E^\circ = - 0.440 V$
Therefore, $Cu^{2+}$ has a greater tendency to undergo reduction than $Fe^{2+}$ or $Fe$ can reduce $($or displace$) Cu^{2+}$ions from its salt solution.
$Fe_{(s)} +Cu^2{(aq)}^\rightarrow Fe^2_{(aq)} + Cu_{(s)}$
Hence, copper sulphate solution cannot be stored in an iron vessel as the iron vessel dissolves forming $Fe^{2+}$ions and $Cu^{2+}$ions from copper sulphate solution forms $Cu.$
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