POLYPROTIC ACIDS AND BASES: Very important!
POLYPROTIC ACIDS AND BASES: Very important! -- acids that can lose, and bases that can pick up, more than one H+ (e.g. diprotic H 2A and triprotic H 3A acids). Ionization occurs stepwise, and each step has its own K a. H 3PO 4 (aq) ⇌ H+ (aq) + H 2PO 4-(aq) K a1 = 7.2 x 10-3 increasing H 2PO 4 - (aq) ⇌ H+ (aq) + HPO 4 2-(aq) K a2 = 6.3 x 10 ...
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