Chapter 4, Problem 4.127AP

(a)

Interpretation Introduction

Interpretation: The balanced equation for the tarnishing of $\text{Ag}$ with ${\text{H}}_{\text{2}}\text{S}$ is to be written. The oxidation numbers of the reactants and products are to be assigned. The number of electrons transferred per mole of silver is to be calculated. The balance equation of ${\text{Ag}}_{\text{2}}\text{S}$ with $\text{Al}$ metal, sodium bicarbonate and water is to be written.

Concept introduction: Oxidation number is defined as the charge present on ions. When an atom forms a chemical bond with another atom, the number of electrons that an atom gain or loses is the oxidation number. It is also known as oxidation state.

The chemical equation is said to be balanced when the number of atoms on the reactant side is equal to the number of atom on the product side.

To determine: The balanced equation for the tarnishing of $\text{Ag}$ with ${\text{H}}_{\text{2}}\text{S}$, the oxidation numbers of the reactants and products are to be assigned and the number of electrons transferred per mole of silver.

(b)

Interpretation Introduction

To determine: The balanced equation for the reaction of ${\text{Ag}}_{\text{2}}\text{S}$ with $\text{Al}$ metal, sodium bicarbonate and water.