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Chemistry / Quantitative Chemical Analysis 8 / Chapter 9 / Problem 9-11

Quantitative Chemical Analysis | 8th Edition | ISBN: 9781429218153 | Authors: Daniel C. Harris

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Heterogeneous equilibrium. CO2 dissolves in water to give carbonic acid (which is mostly

Chapter 9, Problem 9-11

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QUESTION:

Heterogeneous equilibrium. CO2 dissolves in water to give carbonic acid (which is mostly dissolved CO2, as described in Box 6-4). (The equilibrium constant is called the Henrys law constant for carbon dioxide, because Henrys law states that the solubility of a gas in a liquid is proportional to the pressure of the gas.) The acid dissociation constants listed for carbonic acid in Appendix G apply to CO2(aq). Given that in the atmosphere is 103.4 atm, find the pH of water in equilibrium with the atmosphere.

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QUESTION:

Heterogeneous equilibrium. CO2 dissolves in water to give carbonic acid (which is mostly dissolved CO2, as described in Box 6-4). (The equilibrium constant is called the Henrys law constant for carbon dioxide, because Henrys law states that the solubility of a gas in a liquid is proportional to the pressure of the gas.) The acid dissociation constants listed for carbonic acid in Appendix G apply to CO2(aq). Given that in the atmosphere is 103.4 atm, find the pH of water in equilibrium with the atmosphere.

ANSWER:

Step 1 of 3

When reacts with water, it forms carbonic acid.

The solubility of can be determined by using Henry’s law.

According to Henry’s law:

Where, ,, .

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