Chem208_Lecture16_Rev_BW - Today: Polyprotic Acids (16-6);...

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1 Today: Polyprotic Acids (16-6); Titrations (17-4) Tues, 3/25: Lewis Acids/Bases (16.9) Solubility Equilibria (Chapter 18) We will not cover material in 16-8. Question #2: 50.0 mL of the aqueous solution are titrated PS6 due by 2:00 Fri, March 14 (tomorrow) Pick up or download PS7 today
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2 Polyprotic Acids/Bases ± Acids containing more than one hydrogen capable of dissociation ± Common examples: H 2 SO 4 , H 2 S; H 3 PO 4 ± Polybasic bases: H 2 NNH 2 (hydrazine); H 2 NCH 2 CH 2 NH 2 (ethylene diammine) Dissociation or protonation is a step-wise process
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3 Calculate the pH, [HCO 3 ], and [CO 3 2– ] at equilibrium in a solution initially 0.014 M in carbonic acid, “H 2 CO 3 K a 1 = 4.4 x 10 –7 and K a 2 = 4.7 x 10 –11 For “H 2 CO 3 ”.
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Titrations ± An analytical tool used to experimentally determine the concentration of an unknown. ± Used in both acid/base (proton transfer) and REDOX (electron transfer) reactions. ± Acid/base titrations involve the neutralization reaction
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This note was uploaded on 03/29/2009 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).

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Chem208_Lecture16_Rev_BW - Today: Polyprotic Acids (16-6);...

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