Chapter 21, Problem 50PS

Interpretation Introduction

Interpretation:

To estimate the mass of ${\text{Na}}_{\text{2}}{\text{S}}_{\text{2}}{\text{O}}_{\text{3}}$ required to remove ${\text{O}}_{\text{2}}$ from $3\times {10}^4\text{ L}$ of water.

Concept introduction:

Hydrazine 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.

However, before hydrazine came into use it was ${\text{Na}}_{\text{2}}{\text{S}}_{\text{2}}{\text{O}}_{\text{3}}$ that was used to remove the dissolved oxygen in water in steam boilers.