03 Notes - Conjugate Acid Base Pairs

03 Notes - Conjugate Acid Base Pairs - Strong acids have...

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Aim: What are conjugate acid/base pairs? QQ: Explain the difference between a strong acid and a weak acid. Do Now: Consider the dissociation of HCl in water. What substance acts as the acid and the base in the reverse reaction? Conjugte Acid-Base Pairs HCl (aq) + H 2 O (l) H 3 O + (aq) + Cl - (aq) Which substance is the acid and the base in each reaction? Forward: HCl (aq) = acid, H 2 O (l) = base Reverse: H 3 O + (aq) = acid, Cl - (aq) = base Practice: Identify the conjugate acid-base pairs. NH 3 (aq) + HF (aq) NH 4 + (aq) + F - (aq) H 2 O (l) + HF (aq) H 3 O + (aq) + F - (aq) H 2 O (l) + NH 3 (aq) NH 4 + (aq) + OH - (aq) H 2 PO 4 - (aq) + HF (aq) F - (aq) + H 3 PO 4 (aq)
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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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