Dissociation of an aqueous acid (HA) gives HA + H2O H3O + + A- , then pKa is
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---------Acids and Bases
Acidity Constant (Ka)
¾ Acids differ in their H+ donating ability
¾ Measured based on their ability to
donate H+ to water
H-A + H2O A- + H3O+
¾Position of the eq. relates to acid strength
•equilibrium favors the rhs ⇒ strong acid
•equilibrium favors the lhs ⇒ weak acid
-----------Acids and Bases
¾ quantified by measuring the eq. constant
¾ often expressed as pKa (= -log Ka)
H-A + H2O A- + H3O+
Keq = [H3O+] [A-] [HA] [H2O] Ka = [H3O+ ] [A- ]
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