Review Sessions: end of today’s lectures noon: 250 SES 5pm-7pm: A1 LC Final Exam: CHEM 112 - 13806 Fri Dec 14 12:00 PM MWF 8:00 - 10:00 Dr. Balch 250 SES Chemistry 112 General College Chemistry I Substitute Instructor: Dr. Gregory Jursich Email: [email protected] Office: 3235 SEL Office Phone: 312-996-3178 Lab: 1215 SEL Lab Phone: 312-996-8373 Office Hours: MWF 2:00-3:00 pm in 3235 SEL or by appointment ppt slides can be found at URL is: http://www.chem.uic.edu/jursich/chem112 ! " # $ % # &' () (salt of weak base) MB(s) M+(aq) + (weak base) B-(aq) -H3O(aq) + H3O+(aq) HB(aq) + H2O (conjugate acid) * + , ./0+%1- 2 2 %3 ,4, Strategy: 1) Identify solubility equilibrium 2) Relate molar conc. dissolved ions to dissolved solute 3) Set up equilibrium expression and solve for unknown ! "# " $ 4 5 # "! 4 5- $ 3 0 10- 1- 3 ,- ! 4 0 2 13 , !4 6 7 + , ./0+%1- 2 2 %3 ,4, Strategy: 1) Identify solubility equilibrium 2) Relate molar conc. dissolved ions to dissolved solute 3) Set up equilibrium expression and solve for unknown % &' ( ! "# " $ 4 5 # "! +%0 +% 5- $ #1 3 +%0 #1 +%0 #1 %3 ,4 8 9 %:+5; 3 ,4 ! 4 . 9 +%; 3 ,4 ! 4 < . 3 0 19 +%;- 3 0 10 ,4 ! 4 <1- 3 ,- ! 4 0 %3 ,41 3 4, - 6 7 + , - ) ! " % &' (' ! "# " %&' ( # "! % *' ++ ,*($+ % (' *" -. $ -. Note: in sat’d sol’n of Mg(OH)2, [OH-] = 2.88 x 10-4 M in pH=9.0 buffer sol’n [OH-] = 1.0 x 10-5 M + 2 4,44 Strategy: % 6 7 > # 3 ,? ! 4 " = 0+%1- 1) Identify solubility equilibrium 2) Relate molar conc. dissolved ions to dissolved solute 3) Set up equilibrium expression and solve for unknown ! $ , : "# " 4 5 # "! +%0 +% 5- +%0 3 0 19 +%;- 3 ,? 4 $ #1 3 +%0 #1 #1 + , : 2 % = 0+%1- 4,44 ! " 6 7 > "# # 3 ,? ! 4 # "! " $ 3 0 19 +%;- 3 ,? 4 3 4,44 6 7 6 7 9 +%; 3 ,? ! 4 ? +%3 <, %3 @,? . A 0 1 # A -50 15 - 0 1 + H2O A 0 1 5 %-+0 1 Ksp (ZnS) 3> (essentially completely) % 0 1 5 +%0 1 A -50 1 5 +%0 15% 0 Kss = [Zn2+][OH-][HS-] S2-(aq) doesn’t exist much at all 1 . # ! ) "/ 6! )/ (' * Strategy: % "' (' 1) Identify solubility equilibrium 2) Relate molar conc. dissolved ions to dissolved solute 3) Set up equilibrium expression and solve for unknown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∆ amts, T, P , V) B ! ## /F F , " / B P FP N # / 0 E #) / # 2 ( #6 # 2 2 3 / #2 1 3 ( !# -1 # # :1 0 0 , 1 % # -1 1 # 1 0 0 1 1 B" 2 P E 2 reminder: another review session 5 pm today in A1 LC
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