Ch17_Types_4

Ka 56 x 10 10 56 page 1 6 ammonium salts many natural

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Unformatted text preview: k. Ka = 5.6 x 10-10 5.6 Page 1 6 Ammonium Salts • Many natural materials have the -NR 2 group. • –NR2 is a base and forms –NR2H + Caffeine Cadaverine 7 Novocaine Anionic Acids 8 Molecular Bases • Examples: H 2PO4-, HPO42-, HSO4-, HCO3 - —NH3+ 9 • Many natural HPO42- H2PO4- materials have the -NR 2 group. - H+ • –NR2 is a base and forms + H+ –NR2H + Nicotine These anions are all AMPHIPROTICthey are both acids and bases they and 10 Anions as Bases 11 Anions as Bases • Carbonate CO 32-(aq) + H2O(liq) ¸ -(aq) + OH- (aq) HCO3 HCO • Phosphate, PO 43• Sulfate, SO42- 12 Anions as Bases Lactate Acetate All are conjugate bases of weak bases weak acids • Note: All are conjugate bases of weak acids of weak Page 2 Benzoate 13 Amino Acids 14 Acid Strength: pKa H3PO4 Internal proton transfer Ka = 7.5 x 10 -3 7.5 - Carboxylic acid group Basic amine group Substitutent on alpha carbon CH3CO2H + Ka = 1.8 x 10 -5 1.8 pKa = -log Ka pKa = 2.12 pKa = 4.74 4.74 Stronger acids have smaller pK a values Page 3...
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This note was uploaded on 10/19/2011 for the course CHM 2210 taught by Professor Mcquade during the Fall '08 term at FSU.

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