lecture_02_09_10

lecture_02_09_10 - Today Acids and Bases (Chapter 16) Weak...

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1 02-09-10 Today Acids and Bases (Chapter 16) Weak and Strong Acids/Bases K A , K B , pK A , pK B , pH pH calculations Molecular origins of acid/base strength Polyprotic acids Thursday (02-11-10) Indicators Titrations Buffer Solutions Announcements: Today my office hour is at 1-2 pm in room 210 Chapter 16- Acids and Bases - one of the main concepts in chemistry - proton transfer analogous to electron transfer - example of chemical equilibrium
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2 Water can be an acid or a base H 2 O + O 2- 2 OH¯ H 2 O + HCl H 3 O + + Cl¯ Base: proton acceptor Acid: proton donor Bronsted 1923 : Hydroxide ion Hydronium ion Arrhenius 1859-1927 : Base: OH¯ Acid: H + Examples of Acids and Bases
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3 Demos Acids and their reactions Carbon dioxide in breath forms carbonic acid in water CO 2 (g) + H 2 O(l) H 2 CO 3 (aq) ; H 2 CO 3 (aq) +H 2 O(l) H 3 O + (aq) + CO 3 2- (aq) Acid Base Reaction Acetic acid (in vinegar): weak acid; makes baking soda bubble 2 HO 2 CCH 3 + Na 2 CO 3 2 Na + (aq) + 2 O 2 CH 3 ¯(aq)+CO 2 (bubbles) Acid Base Reaction Water as an Acid and as a Base 2 H 2 O (l) H 3 O + (aq) + OH¯ (aq) 2 2 3 ] [ ] ][ [ O H O H HO K + = ] ][ [ 3 + = O H HO K w = 10 -14 [mol 2 L -2 ] [H 2 O]=55.56 mol/L remains nearly constant for dilute solution and is neglected in the formulation of the The ions generated by the autoprotolysis of water are responsible for the electrical conductivity of water. Do not use electrical appliances in the shower! Autoprotolysis constant K w
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4 Example How many H 3 O + ions are contained in a liter of water?
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lecture_02_09_10 - Today Acids and Bases (Chapter 16) Weak...

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