SCAN0011 - 1c 7ém/Jeldfw4 id‘ flue 6/“ng iabu...

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Unformatted text preview: ) 1c 7ém/Jeldfw4 id‘ flue 6/“ng iabu “(hated/7 0m Va, 63 loqfl‘t Mgdti‘ue spontaruoufi; la larcie shiH +0 “Elm-i- 6 A Summary of Chemical Equilibrium and Thermodynamics Significance of K: K tells us the extent of completeness of a chemical reaction as written. Hence. stability of a complex formed, relative strength of acids/bases. solubility of salts. affinity of a substance for solvents may be predicted. Free Energy AG° = A H° - TA 5°: reaction spontaneous if AG is negative in Terms of R, T: AG° = - RTInK, or K = 64‘3“”, R = 3.314 J/K,mol. Away from Equilibrium: AG = AG“ & RTInu Effect of Temperature on K: K = e—AGoiRT .—‘. e—AHa/RT 5 ASD IR. Increase T when AH is positive: What happens to K ?+ K Increase T when AH is negative: What happens to K '2 We will use Keq and Thermodynamics to Deal with: ‘t - Solubility — Ksp — Erecipitation reactions — Common ion'effect — Complexation (You can skip 6-4 and we will cover complexation in chapter 12) - Protic acid—base behavior Ka and KL, —- Bronsted—Lowry acids—bases _ pH — Acids-bases “strength” . - Polyprotic acids-bases - Water Kgp a‘nd Solubility - For a saturated solution, under a given set of conditions, K3p is constant AgCl(s) 2 Ag+ + CI’, KsP = [Ag*][Cl“] = 1.3 x 10-10 What is the molar concentration of Ag+ or Cl- at equilibrium? Bizsfis) 2 2311+ + 331-, K,” = [1313+]1[si'--]3 = 1.6 x 10-72 What is the molar solubility of Bizsl O :30 Carma-l- hauls. \[CLuJYUZ latex. c=l Pasittwt. N0 SpcfltatuLmL/3‘l lC i‘SSmaLt rULgaJn‘LLL mass Nor ...
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