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Experiment 23 C Titration Curves for Strong Acid and Weak Acids

Experiment 23 C Titration Curves for Strong Acid and Weak Acids. Goals Determine Concentration ( Molarity ) of Strong and Weak Acid from Titration Curve Determine Ka for Weak Acid from Titration Curve. NaOH ( aq ) + HCl ( aq ) H 2 O ( l ) + NaCl ( aq ).

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Experiment 23 C Titration Curves for Strong Acid and Weak Acids

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  1. Experiment 23 CTitration Curves for Strong Acid and Weak Acids Goals Determine Concentration (Molarity) of Strong and Weak Acid from Titration Curve Determine Ka for Weak Acid from Titration Curve

  2. NaOH(aq) + HCl(aq) H2O (l) + NaCl(aq) 0.10 M NaOH added to 25 mL of 0.10 M HCl Strong Acid-Strong Base Titrations neutral salt 16.4

  3. At endpoint (midpoint of steep rise)Moles acid = Moles Base Solve for Experimental Procedure MacidVacid= MbaseVbase Experiment 21 Volume at endpoint

  4. CH3COOH (aq) + NaOH(aq) CH3COONa (aq) + H2O (l) Weak Acid-Strong Base Titrations Basic Salt At equivalence point (pH > 7): 16.4

  5. 8. Determine Ka for Acetic Acid CH3COOH (aq) + NaOH(aq) CH3COONa (aq) + H2O (l) Ka = [H+][C2H3O2-] [HC2H3O2] At a volume = ½ endpoint volume; [C2H3O2] =[HC2H3O2] Ka = [H+] = 10 (-pH) Take pH at volume at ½ endpoint volume

  6. Questions to Answer • P 281, 282 • P 283 all but 4 • P 284 #8 • P 285, 286

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