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Chpt 19-1 - Buffer Solutions 18.9 19.1 19.2 Recap of Salts...

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Buffer Solutions 18.9, 19.1, 19.2
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Recap of Salts Possible situations: Probably Given Salt is Cation conj. of strong base Anion conj. of strong acid Nothing Neutral Cation conj. of weak base Anion conj. of strong acid K b of the weak base Acidic [turn K b into K a to solve] Cation conj. of strong base Anion conj. of weak acid K a of the weak acid Basic [turn K a into K b to solve] Cation conj. of weak base Anion conj. of weak acid Both K b and K a Compare the K values of the conjugates
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18.9 Lewis Acid-Base New definitions: Lewis Acid – Any substance that can receive an electron pair Lewis Base – Any substance that can donate an electron pair Draw Lewis diagrams
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Lewis Acids Lewis Acids receive an electron pair so look for atoms that are short the octet rule (e.g. only have 6 electrons on them) Also some atoms with double bonds can receive electrons Lewis base, look for an atom with a lone pair of electrons to give
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Lewis Acids/Bases Draw Lewis structures for NH 3 and BH 3 Determine which is the acid and the base Try: CH 3 COO - and K + Try: SO 3 2- and BeCl 2
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