Chapter 19, Problem 121SAE

Interpretation Introduction

Interpretation:

For the reaction ${\text{Zn(s) + H}}^{+}{\text{(aq) + NO}}_3^{-}\text{(aq) }\to {\text{ Zn}}^{2+}{\text{(aq) + H}}_2\text{O(l) + NO(g)}$ the voltaic cell should be described. Anode and cathode should be labeled. E⁰_cell should be evaluated and the equation should be balanced.

Concept introduction:

An electrochemical cell, which uses chemical reactions for production of electrical energy is known as voltaic cell. In an electrochemical cell, there are two electrodes that can be observed. If oxidation takes place on an electrode, that electrode is called anode. The species in that electrode remove electrons and itself gets oxidized.

If reduction takes place on an electrode, that electrode is called cathode. The species in that electrode absorbs electrons and itself gets reduced. The oxidation and reduction reactions occur in separated compartments which are called half-cells. These half cells are combined by a salt bridge. In voltaic cell, electrons flow from anode to the cathode.