Chapter 21, Problem 49PS

(a)

Interpretation Introduction

Interpretation: The balanced equation has to be given for the reaction of hydrazine with $O_2$ dissolved in water.

Concept Introduction: Hydrazine is a colorless liquid and is produced by oxidation of ammonia. Hydrazine is a base and is a strong reducing agent.

It is used in treating waste water from chemical plants. It is also used to remove dissolved oxygen in water in electric generating plants. Hydrazine acts as a reducing agent and reduces the amount of dissolved oxygen. Otherwise, this dissolved oxygen can corrode the metals of pipes used in the plants.

Balanced chemical equation of a reaction is written according to law of conservation of mass.

(b)

Interpretation Introduction

Interpretation: It should be calculated that the mass of ${\text{N}}_{\text{2}}{\text{H}}_{\text{4}}$ needed to consume all of the dissolved oxygen in ${\text{3×10}}^{\text{4}}\text{ L}$ of water.

Concept Introduction: Hydrazine is a colorless liquid and is produced by oxidation of ammonia. Hydrazine is a base and is a strong reducing agent.

It is used in treating waste water from chemical plants. It is also used to remove dissolved oxygen in water in electric generating plants. Hydrazine acts as a reducing agent and reduces the amount of dissolved oxygen. Otherwise, this dissolved oxygen can corrode the metals of pipes used in the plants.