Chapter 5, Problem 80IAE

Interpretation Introduction

(a)

Interpretation:

The following redox reaction between FeS₂ and O₂ needs to be balanced:

${\text{FeS}}_{\text{2}}{\text{ + O}}_{\text{2}}{\text{ + H}}_{\text{2}}\text{O}\to {\text{ Fe}}^{\text{3+}}{\text{ + SO}}_{\text{4}}^{\text{2-}}{\text{ + H}}^{\text{+}}$

Concept introduction:

• Redox reactions are chemical reactions that are expressed in terms of reduction and oxidation half reactions. They involve transfer of electrons between two species.
• Oxidation reaction involves loss of electrons by one of the reactants whereas reduction is accompanied by gain of electrons by the other reactant.

Interpretation Introduction

(b)

Interpretation:

The minimum amount of CaCO₃ required per kilogram based on the reaction below if the tailings contain 3% S by mass needs to be deduced.

${\text{CaCO}}_3{\text{ + 2H}}^{\text{+}}\to {\text{ Ca}}^{\text{2+}}{\text{ + H}}_{\text{2}}{\text{O + CO}}_{\text{2}}$

Concept introduction:

• Redox reactions are chemical reactions that are expressed in terms of reduction and oxidation half reactions. They involve transfer of electrons between two species.
• Oxidation reaction involves loss of electrons by one of the reactants whereas reduction is accompanied by gain of electrons by the other reactant.