Chapter 19, Problem 19.151MP

Interpretation Introduction

(a)

Interpretation:

The cell reaction should be written using the shorthand notation.

Concept introduction:

A galvanic cell can be represented using a shorthand notation. For example, a redox reaction and its cell notation is given below.

${\text{Zn(s) + Cu}}^{2+}\text{(aq) }\to {\text{ Zn}}^{2+}\text{(aq) + Cu(s)}$

${\text{Zn(s) | Zn}}^{2+}{\text{(aq) || Cu}}^{2+}\text{(aq) | Cu(s)}$

The single vertical line (|) indicates the phase boundary. The double vertical line (||) indicates the salt bridge. The shorthand notation for anode half-cell is written on left side of the double vertical line and notation for cathode half-cell is written on the right side of the double vertical line. The electrodes are indicated in the two extreme ends of the cell notation. Always reactants in each half-cell is written first and followed by products. The electrons move through the external circuit from left to right (from anode to cathode).

Interpretation Introduction

(b)

Interpretation:

Number of kilograms of sodium are consumed should be calculated.

Concept introduction:

The number of coulombs of charge passed through the cell can be calculated using following equation.

$\text{Charge (C) = Current (A) }\times \text{ Time (s)}$

Charge on one mole of electrons is $96500\text{ C}$.