Chem208_Lecture_19_BW - (K sp = 1.80 x 10 10 for AgCl)? 3...

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1 Today: Solubility Equilibria Complexation Equilibria Chapter 18–1, 2, 3, 5, 7, 8 Chapter 24–8, 9 PS8 due by 2:00 Fri, 4/4 Exam II: Tuesday, 4/8 7:30-9:00 Room Assignments are shown on today’s handout Review Session schedule will be announced on Thursday
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2 Sample Problems • In a saturated solution of Mg(OH) 2 , [Mg 2+ ] is found to be 2.56 x 10 –3 M ; [OH ] is found to be 4.68 x 10 –5 M. Calculate K sp for Mg(OH) 2 . • What is the molar solubility (moles/liter) of Mg(OH) 2 in pure water? • What is the pH of a saturated solution of Mg(OH) 2 formed by adding excess Mg(OH) 2 ( s ) to water? • Which is more soluble, Mg(OH) 2 or AgCl
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Unformatted text preview: (K sp = 1.80 x 10 10 for AgCl)? 3 Should a precipitate form when equal volumes of 5.0 x 10 3 M Mg 2+ [ ie , MgCl 2 ( aq )] and 5.0 x 10-3 M OH [ ie , NaOH( aq )] are mixed together? What is the molar solubility of Mg(OH) 2 ( s ) in a solution containing 1.00 x 10 2 M NaOH( aq )? Why does Mg(OH) 2 dissolve in acidic solution? Calculate the molar solubility of Mg(OH) 2 ( s ) in 1.0 M NH 4 Cl( aq ). K b = 1.8 x 10 5 for NH 3 ( aq ). The reaction of interest is: Mg(OH) 2 ( s ) + 2 NH 4 + ( aq ) Mg 2+ ( aq ) + 2 NH 3 ( aq ) + 2 H 2 O( l )...
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Chem208_Lecture_19_BW - (K sp = 1.80 x 10 10 for AgCl)? 3...

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