Chapter 21, Problem 66PS

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# Before hydrazine came into use to remove dissolved oxygen in the water in steam boilers, Na2SO3 was commonly used for this purpose: 2 Na 2 SO 3 (aq) + O 2 (aq) → 2 Na 2 SO 4 (aq) What mass of Na2SO3 is required to remove O2 from 3.00 × 104 L of water as outlined in Study Question 65?

Interpretation Introduction

Interpretation:

To estimate the mass of Na2S2O3 required to remove O2 from 3×104 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 Na2S2O3 that was used to remove the dissolved oxygen in water in steam boilers.

Explanation

The mass of Na2S2O3 required to remove O2 from 3Ã—104Â L of water is calculated below.

Given:

The reaction of Na2S2O3 and O2 is written as,

Â Â Â Â 2Na2S2O3(aq)+O2(aq)â†’2Na2SO4(aq)

It is given that 0.0044Â g of oxygen dissolves in 100Â ml of water at 20Â Â°C.

Mass of Na2S2O3 required to consume 0.0044Â g of dissolved oxygen in 0.1L of water is 0.00440.1g

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