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QuickNotes™  

Acids and Bases: Strong and Weak, pH

  • Arrhenius acids give H+ ; Arrhenius bases give OH-

  • Bronsted-Lowry acids are H+ donors; B-L bases are H+ acceptors

  • Lewis bases are electron pair donors, like NH3 ; Lewis acids are electron pair acceptors like BF3

  • Common strong acids: HCl, HNO3 (monoprotic); H2SO4 (diprotic)

  • Common strong bases: NaOH, KOH, Ca(OH)2

  • Weak acid: acetic, CH3COOH

  • Weak base: NH3

  • Water is both weak acid and weak base; Kw = 1.0 x 10-14

  • Equilibria of weak acids and bases: Ka and Kb

  • pH = -log10[H+] ; pH = 7.0, neutral; pH < 7, acidic; pH >7, basic

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