© copyright pearson prentice hall slide 1 of 50 hydrogen ions and acidity to test a diagnosis of...
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© Copyright Pearson Prentice Hall
Slide 1 of 50
Hydrogen Ions and Acidity
To test a diagnosis of diabetic coma, a doctor orders several tests, including the acidity of the patient’s blood. Results from this test will be expressed in units of pH. You will learn how the pH scale is used to indicate the acidity of a solution and why the pH scale is used.
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Hydrogen Ions and Acidity >
Slide 2 of 50
The pH Concept
The pH Concept
How is the hydrogen-ion concentration used to classify a solution as neutral, acidic, or basic?
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Slide 3 of 50
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>Hydrogen Ions and Acidity The pH Concept
A solution in which [H+] is greater than 1 10–7 M has a pH less than 7.0 and is acidic.
The pH of pure water or a neutral aqueous solution is 7.0.
A solution with a pH greater than 7 is basic and has a [H+] of less than 1 10–7 M.
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Slide 6 of 50
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>Hydrogen Ions and Acidity The pH Concept
pH and Significant Figures
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Hydrogen Ions and Acidity >
Slide 7 of 50
Measuring pH
Measuring pH
What is the most important characteristic of an acid-base indicator?
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Hydrogen Ions and Acidity >
Slide 8 of 50
Measuring pH
An indicator is a valuable tool for measuring pH because its acid form and base form have different colors in solution.
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Slide 9 of 50
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>Hydrogen Ions and Acidity Measuring pH
Phenolphthalein changes from colorless to pink at pH 7–9.
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Slide 10 of 50
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>Hydrogen Ions and Acidity Measuring pH
Universal Indicators
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Slide 11 of 50
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>Hydrogen Ions and Acidity Measuring pH
pH Meters
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Slide 12 of 50
© Copyright Pearson Prentice Hall
>Hydrogen Ions and Acidity Measuring pH
Sample Questions:
A solution in which the hydroxide ion concentration is 1 x 10 -5 is
a. Acidic
b. Basic
c. Neutral
d. None of the above
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Slide 13 of 50
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>Hydrogen Ions and Acidity Measuring pH
Sample Questions:
Which of these solutions is most basic?
a. [H+] = 1 x 10 -11
b. [OH-] = 1 x 10-4
c. [H+] = 1 x 10 -2
d. [OH-] = 1 x 10 -13
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