Lecture11 - Fig. 17-6, p.833 Fig. 17-7, p.835 Effect of...

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Titration, pH Curves Reading: 15.4 and 15.5 HW: P738 # 49, 50, 51, 53, 54, 61
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Titration Adding base of known conc. to acid whose conc. is being determined (or vice versa) Fig. 17-3a, p.829
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Equivalence Point mol H + = mol OH - M A V A = M B V B (stoichiometric) End Point – indicator changes color Fig. 17-3c, p.829
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25.O mL of 0.20 M NaOH is used to neutralize 50.0 mL of HCl. What is the acid concentration? 25.0 mL of 0.20 M Ba(OH) 2 is used to neutralize 50.0 mL of HCl. What is the acid concentration?
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Titration Curve Shows relationship between pH and amount of acid or base added Shows type of acid / base reaction (strong vs. weak) Helps choose appropriate indicators
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Strong Acid / Strong Base Fig. 17-6, p.831
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Weak Acid / Strong Base
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Unformatted text preview: Fig. 17-6, p.833 Fig. 17-7, p.835 Effect of Acid Strength Weak Base / Strong Acid Fig. 17-8, p.835 Titration 1 Acid: 20.0 mL of 0.10 M HCl Base: 0.10 M NaOH 1) Initial pH? 2) pH after 10 mL base added? 3) pH at equivalence point? 4) pH after 25.0 mL base added? Titration 2 Acid: 20.0 mL of 0.10 M HOCl (K a = 3.5 x 10-8 ) Base: 0.10 M NaOH 1) Initial pH? 2) pH after 10 mL base added? 3) pH after 14 mL base added? 4) pH at equivalence point? 5) pH after 25 mL base added? Titration 3 Base: 20.0 mL of 0.10 M NH 3 (K b = 1.8 x 10-5 ) Acid: 0.10 M HCl 1) Initial pH? 2) pH after 7.0 mL acid added? 3) pH after 10 mL acid added? 1) pH at equivalence point? 5) pH after 25 mL acid added?...
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Lecture11 - Fig. 17-6, p.833 Fig. 17-7, p.835 Effect of...

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