Standard potentials are measured against the standard hydrogenelectrode (S.H.E.). Because it is not always convenient to use aS.H.E., often other reference electrodes are used. The saturatedcalomel electrode (S.C.E.) is one commonly used referenceelectrode, with a potential of 0.242 V versus the S.H.E. Using atable of standard reductions, determine what the potential of eachreduction below would be versus the S.C.E.
Cl2+2e------->2cl-
v?
Fe3+ +3e------> Fe
Standard potentials are measured against the standard hydrogenelectrode (S.H.E.). Because it is not always convenient to use aS.H.E., often other reference electrodes are used. The saturatedcalomel electrode (S.C.E.) is one commonly used referenceelectrode, with a potential of 0.242 V versus the S.H.E. Using atable of standard reductions, determine what the potential of eachreduction below would be versus the S.C.E.
Cl2+2e------->2cl-
v?
Fe3+ +3e------> Fe
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Related questions
The saturated calomel electrode, abbreviated SCE, is often used as a reference electrode in making electrochemical measurements. The SCE is composed of mercury in contact with a saturated solution of calomel Hg2Cl2. The electrolyte solution is KCl. ESCE is +0.242 V relative to standard hydrogen electrode.
Calculate the potential for each of the galvanic cells containing a saturated calomel electrode and the given half-cell components at standard conditions. In each case indicate whether the SCE is the cathode or the anode. Standard reduction potentials are found in table:
| Electrode |
SCE |
a) Cu2+ + 2e- → Cu | b) Fe3+ + e- → Fe2+ | c) AgCl + e- → Ag + Cl- | d) Al3+ + 3e- → Al | e) Ni2+ + 2e- → Ni |
| Eo |
+0.242 V |
+ 0.339 V | + 0.771 V | + 0.223 V | - 1.677 V | - 0.257 V |
