class5 - Class #5 Solution Reactions: Acids & Bases...

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Class #5 Solution Reactions: Acids & Bases CHEM 107 A. Bengali Texas A&M University Qatar
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Acids ) What’s an acid? ) Early Observations (17 th century) ) Acids: powerful solvents change colors of dyes sour taste
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Bases ) What’s a base? ) Observations: ) Bases slippery, “soapy” feel change colors of dyes, differently than acids bitter taste
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) Mixing acid + base eliminates the properties of both ) “Neutralization”
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Molecular View ) Acids in water form H 3 O + ions. (“hydronium ions”) ) HCl + H 2 O H 3 O + + Cl - ) Bases in water form OH ions. (“hydroxide ions”) ) NH 3 + H 2 O NH 4 + + OH - ) Neutralization? H 3 O + + OH 2 H 2 O
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Strong vs. Weak ) Strong acids - dissociate completely in solution HCl + H 2 O H 3 O + + Cl ) “One-way” arrow means all HCl breaks up into ions ) Solution contains H 3 O + , Cl , and H 2 O, but not HCl
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HCl = H 3 O + = Cl NO intact HCl present! HCl + H
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class5 - Class #5 Solution Reactions: Acids & Bases...

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