Chapter 16, Problem 166DIA

(a)

Interpretation Introduction

To write: The Lewis structure of ${\text{S}}_{\text{2}}{\text{O}}_{\text{5}}{}^{\text{2}-}$ anion along with molecular shape.

(b)

Interpretation Introduction

To write: The equilibrium equation showing the reaction between metabisulfite anion and water.

(c)

Interpretation Introduction

To determine: The amount of sodium metabisulfite that should be added to obtain free ${\text{SO}}_{\text{2}}$.

(d)

Interpretation Introduction

To explain: How the graph (Figure b) should change to represent the concentration of sulfur dioxide to maintain $0.5\text{ ppm}$ of ${\text{SO}}_{\text{2}}$ in red wine at a given pH.

(e)

Interpretation Introduction

To explain: What should be the concentration of ${\text{SO}}_{\text{2}}$ (free) to keep the pH of red wine at $3.70$.

(f)

Interpretation Introduction

To explain: What happens to the equilibrium species that are present in the sample of white wine if the pH drops from $4.0\text{ to 3}\text{.0}$.