In class notes for November 14, 2007

In class notes for November 14, 2007 - In class notes for...

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General Chemistry Lecture 102a In class notes for November 14, 2007 Exam #3 o Up to 8-4 (weak acid/weak base equil) OWL o Chapter 8 Up to 8-4 stuff due Thursday 8-5 and beyond due Dec. 2? Office hours Thursday morning cancelled Last Lecture o KaKb=Kw or pKa + pKb = 14 at 25C o pH of weak acid solutions Today o pH of weak base solutions o hydrolysis of salts pH of weak bases (weak base equilibrium) o CH 3 CO 2 H is acetic acid o CH 3 CO 2 - is the conjugate base What is pH of O.25 M Na + CH 3 CO 2 - solution? o Find the concentration of OH - CH 3 CO 2 - + H 2 O OH - + CH 3 CO 2 H Ka=1.8 x 10 -5 Kb= = - . - = . - KwKa 1 x 10 41 8 x 10 5 5 55 x 10 10 Set up ICE table SeeA pH + pOH = 14 we will be given Ka on test, and other constants Hydrolysis of salts o Salt of strong acid and strong base is neutral
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General Chemistry Lecture 102a
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Unformatted text preview: In class notes for November 14, 2007 NaOH + HCl NaCl + H → 2 O Na + + H 2 O does not make NaOH + OH- Cl-+ H 2 O does not make HCl + OH-o Salt of weak acid and strong base is a basic pH CH 3 CO 2 H + NaOH Na → + CH 3 CO 2 + H 2 O o Salt of weak base and a strong acid has an acidic pH NH 3 + HCl ⇋ NH 4 + Cl-+ H 2 O NH 4 + + H 2 O ⇋ • Clicker Questions o Consider the reaction H 2 (g) + S (g) ⇋ H 2 S (g) (exothermic) When extra S (s) is added the reaction will Not have any macroscopic change o #2 Will shift to the right o #3 No change o #4 Shift to the left, heat is a product, shifts to the left to get rid of extra product o Acids and bases #1...
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