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Unformatted text preview: Strong acids have weak conjugate bases Weak acids have strong conjugate bases HCl (aq) + H 2 O (l) H 3 O + (aq) + Cl-(aq) strong weak strong weak acid base acid base Amphoteric Substances Can behave as a Bronsted-Lowry acid or base Must be able to donate and accept a proton CO 3 2- HCO 3-- H 2 CO 3 Practice: Are the following substances amphoteric? HCO 3-NO 3-H 3 PO 4 HSO 4 H 2 O HPO 4 2-CN-OH- Conclusions Bronsted-Lowry acids and bases always come in pairs Strong acids have weak conjugate bases Amphoteric substances act as both acids and bases...
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- Spring '11