Chapter 3
Chapter 3
Chapter 3
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The pH Scale<br />
• In any aqueous solution at 25°C the product of H +<br />
and OH – is constant and can be written as<br />
• The pH of a solution is defined by the negative<br />
logarithm of H + concentration, written as<br />
• For a neutral aqueous solution, [H + ] is 10 –7 , so<br />
© 2011 Pearson Education, Inc.<br />
[H + ][OH – ] = 10 –14<br />
pH = –log [H + ]<br />
pH = –(–7) = 7
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