2 p h and indicators
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pH and Indicators
Chemistry
Mrs. Coyle
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Basic14>ph>7
Neutral
ph=7
Acidic 1<pH<7
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Self Ionization of H2O
H2O H+ (aq) + OH- (aq)
Ion Product Constant K w for Water:
Kw= [H+ ] x [OH-] =1.0 x 10 -14
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For pure H2O
[H+ ] = [OH-] = 1.0 x 10-7M
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pH
• 1909 Soren Sorensen (Danish)
pH=-log[H+]
What is the pH of pure water?
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Ex 1: Find the pH for [H+]=10-3M
• Answer: pH=3
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Ex 2: Find the pH for [H+]=5x10-3M
• Answer: pH=2.3
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Finding [H+] from pH
• [H+]= 10-pH
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Ex 3: Find the [H+] for pH=5
• Answer: [H+] = 10-5 M
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Ex 4: Find the [H+] for pH=5.8
• [H+]= 10-pH
• Answer: [H+] = 1.6x10-6 M
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pOH
pH=-log[H+]
pH + pOH=14
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Basic(Alkaline)Solutions
Acidic Solutions
Neutral Solutions
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Acids
Change phenolphthalein to colorless.
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Acids
• Turn litmus paper from blue to red.
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Bases
Change phenolphthalein to pink.