Chpt%2018-3

Chpt%2018-3 - Making Acids out of Nothing at All 18.7, 18.9...

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Making Acids out of Nothing at All 18.7, 18.9
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From Chem 1 Salts are any ionic compound Cation Positive charge Metal (left side of periodic table) – Or NH 4 + Anion Negative charge Non-metal (right side of periodic table) – Or polyatomic ions (SO 4 2- , Cr 2 O 7 2- )
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Last time Dissolving NH 4 Br made an acidic solution Write the reaction where the acidic solution is made Why didn’t it make a basic solution?
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Conjugates For each salt, examine the cation and anion (Example: NaBr) The cation can always serve as an acid: Na + ( aq ) + H 2 O( l ) NaOH( aq ) + H + ( aq ) The anion can always serve as a base: Br - ( aq ) + H 2 O( l ) HBr( aq ) + OH - ( aq ) Note: Neither of these reactions happens to a large extent; the K for each reaction is very small
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With NaBr what is the strength of Na + as an acid? What is the strength of Br - as a base? Salts that feature a
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Chpt%2018-3 - Making Acids out of Nothing at All 18.7, 18.9...

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