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Assume that five weak acids, identified only by numbers (1, 2, 3, 4, and 5) have the following ionization constants: A1 - Ka = 1.0x10^-3 A2 - Ka = 3.0x10^-5 A3 - Ka = 2.6x10^-7 A4 - Ka = 4.0x10^-9 A5 - Ka = 7.3x10^-11 The anion of which acid is the stronges base? a) A2 b) A5 c) A3 d) A1 e) A4