Chapter 13.5, Problem 2.3ACP

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

What is the solubility of CO2 in water at 25 °C when the pressure of the gas is 3.7 × 10−4 bar?

Interpretation Introduction

Interpretation: The solubility of CO2 in water at 250C has to be calculated if the pressure of the gas is 3.7×10-4bar.

Concept introduction:

Henry’s law: The solubility of a gas in liquid is directly proportional to the gas pressure.

Sg= kHPg,where,Sgisthegassolubility(inmol/kg)kHis Henry's constant Pg is the partial pressure of the gaseous solute.

Explanation

Given data:

partialâ€‰pressureâ€‰â€‰ofâ€‰CO2â€‰â€‰â€‰=â€‰â€‰3.7Ã—10-4â€‰â€‰barHenry'sâ€‰â€‰constantâ€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰=â€‰â€‰â€‰0.034â€‰mol/kg.bar

According to Henryâ€™s law:

â€‰Sg â€‰â€‰â€‰=â€‰â€‰â€‰â€‰kHPg

Substituting the given values in the above equation, the solubility can be calculated.

Sgâ€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰=â€‰0

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