lecture 21 - Turn on Camtasia Recording! Today Ka and pKa...

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Unformatted text preview: Turn on Camtasia Recording! Today Ka and pKa ... 1 The pH Scale- Review ScaleImportant Equations What does pH mean?? ... 2 [ [H3O+], [ [OH-] and p pH If the pH of Coke is 3.12, it is ____________. ... 3 Which of these compounds can not function as a Bronsted Lowry Bronsted-Lowry acid in water? A. B. C. C D. D H2S HSO3 NH3 HNO2 4 ... What is the pH of a solution 2 that is 1.85 x 10-2 M nitric 1 85 acid? A. B. C. D. 1.733 1.850 2.00 7.33 ... 5 The hydronium ion of an aqueous 2 M. solution is 1.7 x 10-2 M Which is 17 true for this solution? 1. [OH] =1.0 x 10-13; pH = 13.0; pOH =2.33 2. [OH] =5.9 x 10-1 ; pH = 13.0; pOH =1.00 13 3. [OH] =5.9 x 10-13; pH = 1.77; pOH =12.23 2 4. [OH] =5.9 x 10-2; pH = 12.23; pOH =1.77 5. [OH] =6.7 x 1013; pH = 13; pOH =10 ... 6 ... 7 Increas sing Bas Strength se n ... 8 Increa asing Ac Stren cid ngth Equilibrium Constants q for Weak Acids Weak acid has Ka < 1 Leads to small [H3O+] and a pH of 2 - 7 ... 9 Equilibrium Constants q for Weak Bases Weak base has Kb < 1 Leads to small [OH-] and a pH of 12 - 7 ... 10 Increas sing Bas Strength se n ... 11 Increa asing Ac Stren cid ngth Equilibria Involving Weak Acids and Bases Aspirin is a good example of a weak l f k acid, Ka = 3.2 x 10-4 ... 12 Equilibria Involving Weak Acids and Bases Acid acetic, CH3CO2H ammonium, NH4+ bicarbonate, HCO3Conjugate Base CH3CO2-, acetate NH3, ammonia CO32-, carbonate A weak acid ( b k id (or base) i one th t i i ) is that ionizes t a to VERY small extent (< 5%). ... 13 Equilibria Involving Weak Acids and Bases Consider acetic acid, CH3CO2H (HOAc) (HOAc) (K is designated Ka for ACID) ACID) Because [H3O+] and [OAc-] are SMALL Ka << 1. SMALL, 1 ... 14 Increas sing Bas Strength se n ... 15 Increa asing Ac Stren cid ngth Relation of Ka, Kb, [ [H3O+] and pH ... 16 pKa, pKb, relation of Kw, Ka & Kb ... 17 The value of Ka for acetylsalicylic 4 acid (asprin) HC9H7O4 is 3.0 x 10-4. (asprin), 30 What is the reaction that goes with the equilibrium constant. eq ilibri m constant ... 18 The value of Ka for acetylsalicylic acid (asprin), HC9H7O4 is 3.0 x 10-4. What is the pKa? ... 19 ...
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This note was uploaded on 04/15/2008 for the course CHEM 112 taught by Professor Hardy during the Spring '08 term at UMass (Amherst).

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