Lecture 8. AcidBases

Lecture 8. AcidBases - Chapter 8: Acid-Base Equilibria The...

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Unformatted text preview: Chapter 8: Acid-Base Equilibria The pH Scale The pH = -log[H+] 3 [H+] = 10--3 M ⇒ pH = -log(10-3) = 3 10 [H+] = 10--10 M ⇒ pH = -log(10-10) = 10 8 [H+] = 3.8 x 10--8 M ⇒ pH = -log(3.8 x 10-3) = 7.42 Daniel C. Harris, Exploring Chemical Analysis, 2nd ed., W.H. Freeman and Company, New York, 2001. Freeman Autoprotolysis of Water Autoprotolysis H2O + H2O H2O H3O+ + OHH+ + OHat 25 ºC Kw = [H+][OH-] = 1.0 x 10-14 What is the concentration of H+ and OH- in pure water? What is the conjugate (“corresponding”) base of H3O+? What is the conjugate acid of H2O? What is the conjugate base of H2O? Strong Acids and Bases Strong HCl(aq) ⇒ H+ + Cl∴ The pH of 0.01 M HCl(aq) is: NaOH(aq) ⇒ Na+ + OH∴ The pH of 0.01 M KOH(aq) is: Gary D. Christian, Analytical Chemistry, 6th ed., John Wiley & Sons, Inc., U.S.A., 2004. Ka and Kb of Conjugate Acids and Bases HA HA A + H2O - H+ + AHA + OH H+ + OH- [H+ ][A - ] Ka = [HA] [HA][OH- ] Kb = [A - ] H2O Kw = [H+][OH-] Ka x Kb = Kw Daniel C. Harris, Exploring Chemical Analysis, 2nd ed., W.H. Freeman and Company, New York, 2001. Freeman Fraction of Dissociation [A - ] Φραχτιον ∆ ισσοχιατεδ= [A ] + [HA] Daniel C. Harris, Exploring Chemical Analysis, 2nd ed., W.H. Daniel Freeman and Company, New York, 2001. Freeman • What is the pH of 10-8 M HCl? What • What is the pH of 10-1 M acetic acid? What ...
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