The saturated calomel electrode, abbreviated SCE, is often used as a reference e

Question

The saturated calomel electrode, abbreviated SCE, is often used as a reference electrode in making electrochemical measurements. The SCE is composed of mercur in contact with a saturated solution of calomel (Hgd2). The electrolyte solution is saturated KCl·8SCE is +0.242 V relative to the standard hydrogen electrode. Calculate the potential for each of the following galvanic cells containing a saturated calomel electrode and the given half-cell components at standard conditions. Ir each case, indicate whether the SCE is the cathode or the anode. Standard reduction potentials are found in the Standard Reduction Potentials table. at standard conditions. n (a) Cu2+ + 2 e- Cu SCE role: O cathode O anode (b) Cd2+ + 2 e- Cd SCE role: O cathode O anode (c) Zn2+ + 2 e- Zn SCE role: cathode O anode

Explanation / Answer

Cu+2 +2e- ----> Cu   E0 = 0.337V

cathode

b.

Cd+2 +2e- -----> Cd    E0 = -0.403V

anode

c.

Sn+2 +2e- ----> Sn     E0 = -0.14V

act as anode

d. I2 +2e------> 2I-     E0 = 0.535V

act as cathode

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