   Chapter 19.4, Problem 19.5CYU

Chapter
Section
Textbook Problem

(a) Rank the following metals in their ability to function as reducing agents: Hg, Sn, and Pb. (b) Which halogens will oxidize mercury to mercury(II)?

(a)

Interpretation Introduction

Interpretation:

The given metals has to be ranked in their ability to function as reducing agents.

Concept introduction:

Standard electrode potential

Under certain conditions a cell potential is measured it is called as standard potential (Ecello).

Standard potential (Ecello) can be calculated by the following formula.

Ecello=Ecathodeo-Eanodeo

The Ecello value is positive, the reaction is predicted to be product favoured at equilibrium.

The Ecello value is negative, the reaction is predicted to be reactant favoured at equilibrium.

Electrochemical series:

It is a decreasing order of the reduction potentials. The most positive E0 are placed in the top in the electrochemical series, it has greater tendency for reduction and lower tendency of oxidation. And the most negative E0 values of elements are placed in the bottom of the series.

Explanation

Reducing agents have low redox potential values. Therefore, the order is as follows.

The E0 values of the given metal atoms are given below:

Sn2+(aq) + 2e- Sn(s) ; E0= -0.14VPb2+(aq) +2e

(b)

Interpretation Introduction

Interpretation:

The halogens which will oxidize mercury to mercury (III) has to be determined.

Concept introduction:

Standard electrode potential

Under certain conditions a cell potential is measured it is called as standard potential (Ecello).

Standard potential (Ecello) can be calculated by the following formula.

Ecello=Ecathodeo-Eanodeo

The Ecello value is positive, the reaction is predicted to be product favoured at equilibrium.

The Ecello value is negative, the reaction is predicted to be reactant favoured at equilibrium.

Electrochemical series:

It is a decreasing order of the reduction potentials. The most positive E0 are placed in the top in the electrochemical series, it has greater tendency for reduction and lower tendency of oxidation. And the most negative E0 values of elements are placed in the bottom of the series.

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