A voltaic cell is constructed using the reaction Mg(s) + 2 H+(aq) --> Mg2+(aq) +

Question

A voltaic cell is constructed using the reaction Mg(s) + 2 H+(aq) --> Mg2+(aq) + H2(g) (a) Write equations for the oxidation and reduction half-reactions. (b) Which half-reaction occurs in the anode compartment, and which occurs in the cathode compartment? (c) Complete the following sentences: Electrons in the external circuit flow from the ___ electrode to the ___ electrode. Negative ions move in the salt bridge from the ___ half-cell to the ___ half-cell. The half-reaction at the anode is ___, and that at the cathode is ___.

Explanation / Answer

a) oxidation half:-

Mg(s) ---------> Mg2+(aq) + 2(e-)

reduction half:-

H+(aq) + e- --------> (1/2)H2(g)

b) oxidation occurs in anode and reduction occurs in cathode

c) Electrons in the external circuit flow from the anode electrode to the cathode electrode. Negative ions move in the salt bridge from the oxidation half-cell to the reduction half-cell. The half-reaction at the anode is negative, and that at the cathode is positive.

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