ForExam3Review_08

ForExam3Review_08 - Exam#3 will cover chapters 15(except...

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Exam #3 will cover chapters 15 (except 15.8) and 16. - Acid and bases conjugate acids/bases, strength equilibrium problems names of strong acids (HCl, HBr, HI, nitric, sulfuric, perchloric) names of strong bases (hydroxides of 1st and 2nd groups) - Salts and buffers: determine acidity/basicity, calculate pH, etc. know chemical reactions relevant to salts and buffers in solution. derive buffer log equation (Hendeson-Hasselbalch) prepare buffer by titration change in pH upon addition of a strong acid/base to buffer design buffer of a given pH; buffer capacity - Polyprotic acids - Solubility and precipitation solubility and solubility product precipitation under different conditions separation of salts and effect of pH on solubility complex ions formation and solubility - Super acids: see lecture notes; recognize names and main reactions Review: Equilibrium, Le Chatelier principle
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Derive: The buffer formula: Henderson- Hasselbalch Equation Buffer reactions: HA, A - : H + + A - Æ HA OH - + HA Æ H 2 O + A - B, BH + : H + + B Æ BH + OH - + BH + Æ B + H 2 O A basic buffer: NH 3 and NH 4 Cl An acidic buffer: Acetic acid and sodium acetate [] log a HA pH pK A ≈− log a acid pH pK base ) ( ) ( ) ( 2 aq OH aq HA O H aq A + + 23 () BH aq H O B aq H O aq ++ +⇔ + Conj. base in water: Conj. acid in water: Need to Memorize
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Salts of weak acid – strong base: Weak acid HA strong conjugate base A - : A - ( aq ) + H 2 O( l ) HA( aq ) + OH - ( aq ) – solution will be basic (pH>7) Examples: NaCH 3 COO, NaCN, K 2 CO 3 ,NaHCO 3 Compare: Na
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ForExam3Review_08 - Exam#3 will cover chapters 15(except...

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