lec17 - Announcements Office hours 11:00 am 12:00 pm M...

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1 Announcements • Office hours – 11:00 am – 12:00 pm M • Learning Skills Center • An Exam is imminent !!! • So is a day off … Last Time • Weak acids and bases •K a , pK a and K b , pK b • Relative strengths • Factors that determine acidity • pH calculations Relative Strengths HA(aq) + H 2 O(l) H 3 O + (aq) + A (aq) •I f H 2 O is a stronger base than the conjugate base A , then HA is a strong acid. B (aq) + H 2 O(l) HB(aq) + OH (aq) •I f H 2 O is a stronger acid than the conjugate acid HB, then B is a strong base. Example What is the pH of a 1 M CH 3 NH 2 solution given that the K
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2 Dilute Solutions – Strong Acids HA(aq) + H 2 O(l) H 3 O + (aq) + A (aq) • If [HA] = 10 –3 then [H 3 O + ] = 10 –3 and pH = 3 • Incorrectly expect if [HA] = 10 –8 then pH = 8 • Must account for autoprotolysis 2H 2 O(l) H 3 O + (aq) + OH (aq) [H 3 O + ] = 10 –7 Dilute Solutions – Strong Bases
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This note was uploaded on 04/23/2008 for the course CHEM 2B taught by Professor Clemens during the Winter '08 term at UC Davis.

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lec17 - Announcements Office hours 11:00 am 12:00 pm M...

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