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Unformatted text preview: (aq) Can calculate K b from K a using HOAc(aq) + H 2 O(l) H 3 O + (aq) + OAc (aq) K b = = = [HOAc][OH ] [OAc ] [OAc ][H 3 O + ] [HOAc] K w K w K a Example What is the pH of a 3.2 x 10 2 Mg(OAc) 2 solution given that K a = 1.8 x 10 5 for HOAc? Combining Acids, Bases, & Salts Considered simple weak acids and bases Extend equilibrium concepts to mixtures Weak acids and salts use K a Weak bases and salts use K b Salt modifies initial concentrations Example Calculate the pH of a solution that is 0.25 M in CH 3 NH 2 and 0.32 M in CH 3 NH 3 Cl using Kb = 3.6 x 10 4 ....
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- Winter '08