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pH and Indicators Chemistry Mrs. Coyle
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Basic 14>ph>7 Neutral ph=7 Acidic 1<pH<7
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Self Ionization of H 2 O H 2 O H + (aq) + OH - (aq) Ion Product Constant K w for Water: K w = [H + ] x [OH - ] =1.0 x 10 -14
![Self Ionization of H 2 O H 2 O H + (aq) + OH - (aq) Ion Product Constant K w for Water: K w = [H + ] x [OH - ] =1.0 x](http://images.slideplayer.com./8/2376773/slides/slide_4.jpg "Self Ionization of H 2 O H 2 O H + (aq) + OH - (aq) Ion Product Constant K w for Water: K w = [H + ] x [OH - ] =1.0 x")
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For pure H 2 O [H + ] = [OH - ] = 1.0 x 10 -7 M
![For pure H 2 O [H + ] = [OH - ] = 1.0 x M](http://images.slideplayer.com./8/2376773/slides/slide_5.jpg "For pure H 2 O [H + ] = [OH - ] = 1.0 x M")
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pH 1909 Soren Sorensen (Danish) pH=-log[H + ] What is the pH of pure water?
![pH 1909 Soren Sorensen (Danish) pH=-log[H + ] What is the pH of pure water](http://images.slideplayer.com./8/2376773/slides/slide_6.jpg "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 -3 M Answer: pH=3
![Ex 1: Find the pH for [H + ]=10 -3 M Answer: pH=3](http://images.slideplayer.com./8/2376773/slides/slide_7.jpg "Ex 1: Find the pH for [H + ]=10 -3 M Answer: pH=3")
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Ex 2: Find the pH for [H + ]=5x10 -3 M Answer: pH=2.3
![Ex 2: Find the pH for [H + ]=5x10 -3 M Answer: pH=2.3](http://images.slideplayer.com./8/2376773/slides/slide_8.jpg "Ex 2: Find the pH for [H + ]=5x10 -3 M Answer: pH=2.3")
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Finding [H + ] from pH [H + ]= 10 -pH
![Finding [H + ] from pH [H + ]= 10 -pH](http://images.slideplayer.com./8/2376773/slides/slide_9.jpg "Finding [H + ] from pH [H + ]= 10 -pH")
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Ex 3: Find the [H + ] for pH=5 Answer: [H + ] = 10 -5 M
![Ex 3: Find the [H + ] for pH=5 Answer: [H + ] = M](http://images.slideplayer.com./8/2376773/slides/slide_10.jpg "Ex 3: Find the [H + ] for pH=5 Answer: [H + ] = M")
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Ex 4: Find the [H + ] for pH=5.8 [H + ]= 10 -pH Answer: [H + ] = 1.6x10 -6 M
![Ex 4: Find the [H + ] for pH=5.8 [H + ]= 10 -pH Answer: [H + ] = 1.6x10 -6 M](http://images.slideplayer.com./8/2376773/slides/slide_11.jpg "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
![pOH pH=-log[H + ] pH + pOH=14](http://images.slideplayer.com./8/2376773/slides/slide_12.jpg "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.
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