chem126--Acids I Intro and pH

chem126--Acids I Intro and pH - FE2 Acids and Bases I....

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Acids and Bases I. Arrhenius Acids and Bases: An acid—substance that produces [H + ] in H 2 O. A base—substance that produces [OH - ] in H 2 O. HNO 3 HClO 4 (perchloric acid) HCl HBr HI H 2 SO 4 (sulfuric acid) Strong Acids HF CH 3 COOH Weak Acids Properties Taste sour (don’t taste any that aren’t foods) Neutralize bases React with many metals to produce H 2 (g) Turn Litmus paper red NaOH KOH Strong bases NH 3 CH 3 NH 2 Weak bases Taste bitter (don’t taste) Slippery to touch Neutralize acids Turn Litmus paper blue E2
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The red wood ant Formica rufa Formic acid HCOOH Common Acids Dilute (5%) acetic acid CH 3 COOH Citric acid (Why orange sweet?)
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Acids react with many metals to produce H 2 (g) McQuarrie Mg(s) + 2H + (aq) Mg 2+ (aq) + H 2 (g)
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Common Bases O | | Na -- O -- C -- O -- H Baking soda (Sodium bicarbonate) sodium hydrogen carbonate NaOCOOH Soap Detergents Dilute aqueous ammonia NH 3 (aq)
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Acids and Bases Neutralize Each Other to Form Water ( ) ( ) ( ) 2 Ha q O q H O l +− +→ ( ) ( ) ( ) ( ) 2 HCl aq NaOH aq H O l NaCl aq + ( ) ( ) ( ) ( ) ( ) ( ) ( ) 2 Cl aq Na a q O q qN a a H qC l a q Ol −+ + ++ + + + Exothermic—heat released
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Acids and Bases II. Br Ø nsted-Lowry Acids and Bases: An acid—proton donor An base—proton acceptor ( ) ( ) ( ) 34 HCl g NH g NH Cl s + ± ( ) ( ) ( ) HCl aq H aq Cl aq +−
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This note was uploaded on 04/07/2008 for the course CHEM 126 taught by Professor Biolsi during the Spring '08 term at NJIT.

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chem126--Acids I Intro and pH - FE2 Acids and Bases I....

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