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Example 2.8 indicates that the pH of pristine rainwater is not the same as the pi of pure water due to the presence of carbon dioxide in the atmosphere. There are other naturally occurring substances in the atmosphere that also affect pH. Sulfur dioxide (SO,) lowers pH, while ammonia and alkaline dust raise it. When all such natural substances are accounted for, rainfall is likely to have a pH value somewhere between 5 and 6 before it is influenced by human activities. As a result, some define acid rain caused by human activities to be rainfall with a pH of 5 or below while others prefer to define it in terms of the carbonate calculation given above, that is, as precipitation with a pH less than 5.6. Acid deposition is discussed more fully in Chapters 4 and 7.

Example 2.8 indicates that the pH of pristine rainwater is not the same as the pi of pure water due to the presence of carbon dioxide in the atmosphere. There are other naturally occurring substances in the atmosphere that also affect pH. Sulfur dioxide (SO,) lowers pH, while ammonia and alkaline dust raise it. When all such natural substances are accounted for, rainfall is likely to have a pH value somewhere between 5 and 6 before it is influenced by human activities. As a result, some define acid rain caused by human activities to be rainfall with a pH of 5 or below while others prefer to define it in terms of the carbonate calculation given above, that is, as precipitation with a pH less than 5.6. Acid deposition is discussed more fully in Chapters 4 and 7.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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Example 2.8 indicates that the pH of pristine rainwater is not the same as the ph of pure water due to the presence of carbon dioxide in the atmosphere. There are other naturally occurring substances in the atmosphere that also affect pH. Sulfur dioxide (SO,) lowers pH, while ammonia and alkaline dust raise it. When all such natural substances are accounted for, rainfall is likely to have a pH value somewhere between 5 and 6 before it is influenced by human activities. As a result, some define acid rain caused by hum:an activities to be rainfall with a pH of 5 or below while others prefer to define it in terms of the carbonate caleulation given above, that is, as precipitation with a pH less than 5.6. Acid deposition is discussed more fully in Chapters 4 and 7.
Transcribed Image Text:Example 2.8 indicates that the pH of pristine rainwater is not the same as the ph of pure water due to the presence of carbon dioxide in the atmosphere. There are other naturally occurring substances in the atmosphere that also affect pH. Sulfur dioxide (SO,) lowers pH, while ammonia and alkaline dust raise it. When all such natural substances are accounted for, rainfall is likely to have a pH value somewhere between 5 and 6 before it is influenced by human activities. As a result, some define acid rain caused by hum:an activities to be rainfall with a pH of 5 or below while others prefer to define it in terms of the carbonate caleulation given above, that is, as precipitation with a pH less than 5.6. Acid deposition is discussed more fully in Chapters 4 and 7.
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