pH and Acid-Base Indicators - PowerPoint PPT Presentation

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pH and Acid-Base Indicators

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pH and Acid-Base Indicators The pH Scale The power of hydrogen Expresses the concentration of H+ Ionization of Water Pure water is neutral (pH 7) Why? – PowerPoint PPT presentation

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Title: pH and Acid-Base Indicators


1
pH and Acid-Base Indicators
2
The pH Scale
  • The power of hydrogen
  • Expresses the concentration of H

Acidic Neutral Basic
H gt OH- H OH- H lt OH-
3
Ionization of Water
  • Pure water is neutral (pH 7)
  • Why?
  • You might think that pure water contains no H or
    OH-
  • However, even pure water ionizes slightly
  • At SATP, 2 in every billion water molecules
    ionize
  • H2O(l) ? H(aq) OH-(aq)
  • i.e H in pure water is 1.0 X 10-7 mol/L

4
Relating H to pH
H 10-pH
Acidic Neutral Basic
H gt 1.0 X 10-7 M pH lt 7 i.e. 1.0 X 10-6 M 1.0 X 10-2 M H 1.0 X 10-7 M pH 7 H lt 1.0 X 10-7 M pH gt 7 i.e. 1.0 X 10-8 M 1.0 X 10-12 M
pH -logH
5
Acid-Base Indicators
  • A common method for determining pH of a solution
    is to use an indicator
  • Indicators respond to changes in H (change
    colour)

Universal Indicator
Litmus Paper
Cabbage Juice
6
Bromothymol blue
Phenolphthalein
7
Homework
  • P. 371 2-6
  • P. 371 9,10
  • P. 375 1-4,6cd,12
  • http//www.titrations.info/acid-base-titration-ind
    icators-preparationcongo-red

8
Bromothymol blue
Universal Indicator
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