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Lecture 112/14/05 Exam 1 Wednesday: Come early if you want extra time Review session today 4 – TSC 006
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pH: Describes the concentration of H 3 O + pX = -log X pH = -log [H 3 O + ] [H 3 O + ] = 10 -pH So if [H 3 O + ] = 10 -3 M, pH = ? If pH = 6, [H 3 O + ] = ?
![pH: Describes the concentration of H 3 O + pX = -log X pH = -log [H 3 O + ] [H 3 O + ] = 10 -pH So if [H 3 O + ] = M, pH = .](http://images.slideplayer.com/16/4942678/slides/slide_2.jpg "If pH = 6, [H 3 O + ] = .")
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Autoionization of Water H 2 O + H 2 O ↔ H 3 O + + OH - K w = [H 3 O + ][OH - ] What is the definition of neutral, acidic, and basic solutions? Neutral: [H 3 O + ] = [OH - ] Acid: [H 3 O + ] >[OH - ] Base: [H 3 O + ] < [OH - ]
![Autoionization of Water H 2 O + H 2 O ↔ H 3 O + + OH - K w = [H 3 O + ][OH - ] What is the definition of neutral, acidic, and basic solutions.](http://images.slideplayer.com/16/4942678/slides/slide_3.jpg "Neutral: [H 3 O + ] = [OH - ] Acid: [H 3 O + ] >[OH - ] Base: [H 3 O + ] < [OH - ].")
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K w = [H 3 O + ][OH - ] THUS at 25°C, neutral pH = 7
![K w = [H 3 O + ][OH - ] THUS at 25°C, neutral pH = 7](http://images.slideplayer.com/16/4942678/slides/slide_4.jpg "K w = [H 3 O + ][OH - ] THUS at 25°C, neutral pH = 7")
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T (°C)KwKw 100.29 x 10 -14 150.45 x 10 -14 200.68 x 10 -14 251.01 x 10 -14 301.47 x 10 -14 505.48 x 10 -14 Neutral pH = 7.27 Neutral pH = 6.92
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pH and pOH K w = [H 3 O + ][OH - ] At 25 °C 10 -14 =[H 3 O + ][OH - ] -log (10 -14 =[H 3 O + ][OH - ]) -log (10 -14 ) = -log([H 3 O + ][OH - ]) -log (10 -14 ) = -log[H 3 O + ]-log[OH - ] 14 = pH + pOH
![pH and pOH K w = [H 3 O + ][OH - ] At 25 °C =[H 3 O + ][OH - ] -log ( =[H 3 O + ][OH - ]) -log ( ) = -log([H 3 O + ][OH - ]) -log ( ) = -log[H 3 O + ]-log[OH - ] 14 = pH + pOH](http://images.slideplayer.com/16/4942678/slides/slide_6.jpg "pH and pOH K w = [H 3 O + ][OH - ] At 25 °C =[H 3 O + ][OH - ] -log ( =[H 3 O + ][OH - ]) -log ( ) = -log([H 3 O + ][OH - ]) -log ( ) = -log[H 3 O + ]-log[OH - ] 14 = pH + pOH")
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How do you measure pH? What is the pH range? pH meter Indicator (color change)
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pH of some common substances pH Bleach12.5 Baking soda8.4 Egg White7.7 Milk6.8 Unpolluted rain5.6 Coffee4.9 Coke2.9 Stomach acid1.2
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Degree of ionization
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pH of strong acid? What is the pH of a 0.001 M HNO 3 solution?
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