Lec-27-Chap16,17-8,1-bare

Lec-27-Chap16,17-8,1-bare - Lec-27-Chap16,17-8,1-bare...

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Lec-27-Chap16,17-8,1-bare 11/4/2011 Acid-Base Titrations. Solubility Equilibria 1 Lec-27: Titrations, Solubility of Ionic Compounds Chapter 16, 17 (Sec. 17-5) 1 Acid-Base Titrations Provides a method in the laboratory to determine the concentration of an acid or a basic sample solution. It relies on the neutralization of the acid or basic sample solution by addition of, respectively, a basic or acid solution of known concentration.     titrant sample sam moles of base or moles of acid or titr e pl ant n n   The equivalence point is reached when the stoichiometric amount of titrant has been added. 2
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Lec-27-Chap16,17-8,1-bare 11/4/2011 Acid-Base Titrations. Solubility Equilibria 2 Equivalence Point Condition For a monoprotic acid HA in the ( sample or titrant ) and a monohydroxide base MOH in the ( titrant or sample ) AA BB V CV C We can find the concentration of the acid (say it was in the sample) by solving the above equation B A A B V C C V 3     titrant sample sam moles of base or moles of acid or titr e pl ant n n   Acid-Base Titrations We consider three cases of titrations: 4 1) titration of a strong acid with a strong base (or of a strong base with a strong acid ) 2) titration of a weak acid with a strong base 3) titration of a weak base with a strong acid
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Lec-27-Chap16,17-8,1-bare 11/4/2011 Acid-Base Titrations. Solubility Equilibria 3 Acid-Base Titrations V tit (mL) pH-S pH-W 0.0 1.0 2.87 40.0 1.95 5.35 50.0 7.0 8.72 50.2 10.3 10.3 Notice that at the equivalence point the pH is basic !!!! 50.00 mL of HCl (strong acid) or HAcO (weak acid) 0.100 mol L –1 with NaOH 0.100 mol L –1 . 5 6 The reason is that at the equivalence point MOH titrant sample HA n n and at this stage, conceptually , the OH would have neutralized all the HA in solution converting it into the conjugate base A . The conjugate base A , however, in actuality reacts with water according to: 2 A H O A O H H   so that the solution at the equivalence point is basic .
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Lec-27-Chap16,17-8,1-bare 11/4/2011 Acid-Base Titrations. Solubility Equilibria 4 Acid-Base Titrations We consider three cases of titrations: titration of a strong acid with a strong base (or of a strong base
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This note was uploaded on 03/06/2012 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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Lec-27-Chap16,17-8,1-bare - Lec-27-Chap16,17-8,1-bare...

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