c103-sp10-0428 - Chemistry 103 Spring 2010 Today 1....

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Unformatted text preview: Chemistry 103 Spring 2010 Today 1. Titration curves and the buffer region. 2. More on solubility equilibrium. Announcements 1. Ch. 16 OWL homework is active. 2. Next midterm exam on May 17 or 19. 3. CSULA closure on May 21 (furlough). 4. CSULA closure on May 31 (holiday). 5. Bring textbook and calculator to each lecture. Chemistry 103 Spring 2010 2 Review equivalence point : moles of H + = moles of OH- (moles of acid = moles of base, when the acid has only one acidic proton and the base has only one hydroxide ion). What is the pH at the equivalence point for a strong acid-strong base titration? HNO 3 + KOH H 2 O(l) + KNO 3 (aq) I 0.100 moles each (sample)+(titrant) C End No products are acidic or basic enough to affect the pH of the solution, so the pH is 7. Note that KNO 3 (aq) = K + (aq) + NO 3- (aq). K + + H 2 O(l) NO 3- + H 2 O(l) Fig. 16.5, p.589. Chemistry 103 Spring 2010 3 What is the pH at the equivalence point for a weak acid-strong base titration? (Note: CH 3 COOH = HA, and CH 3 COO- = A- .) HA + NaOH H 2 O(l) + NaA(aq) I 0.100 moles each (sample)+(titrant) C End Note: NaCH 3 COO(aq) = Na + (aq) + CH 3 COO- (aq) Na + + H 2 O(l) CH 3 COO- + H 2 O(l) CH 3 COOH + OH- I C Eq Equilibrium process results in pH > 7 (basic). (Chapter 15 calculations) Fig. 16.6, p. 591. Chemistry 103 Spring 2010 4 What is the pH at the equivalence point for a weak base-strong acid titration? HCl + NH 3 H 2 O(l) + NH 4 Cl(aq) I 0.100 moles each (sample)+(titrant) C End Note: NH 4 Cl(aq) = NH 4 + (aq) + Cl- (aq) Cl- + H 2 O(l) NH 4 + + H 2 O(l) NH 3 + H 3 O + I C Eq Equilibrium process results in pH < 7 (acidic)....
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c103-sp10-0428 - Chemistry 103 Spring 2010 Today 1....

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