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i Chrome File Edit View History Bookmarks People Window Help 53%D Fri 2:33 PM QOE Kean University-CHEM 1084xwww C www.sapli A Solutión ibiscms/mod/ibis/view.php?id 4322142 Sapling Learning Jump to... Cristina Brenckman, macmillan learning Sapling Learning Kean University - CHEM1084- Fall17-RUBINSTEIN Activities and Due DatesRequired HW 22 My Assignment Resources D 11/18/2017 10:30 AM 07.2/10() 11/16/2017 06:53 PM PrintCalauistor Periodic Table Attempts Score Gradebook Assignnent Information # 17 Question 9 of 10 Available From 11/10/2017 01:00 PM Due Date Points Possible: 10 Grade Category: Required HW 100 Sapling Learning Map 11/18/2017 10:30 AM Suppose a solution contains 0.21 M Pb2 and 0.45 MA+ Calculate the pH range that would allow Al(OH)s to precipitate but not Pb(OH2 The Kup values for Al(OH) and Pb OH)2 can be found here. 41 100 Policies: 39 You can check your answers. You can view solutions when you complete or give up on any question. You can keep trying to answer each question until you get it right or give up You lose 5% of the points available to each answer in your question for each incorrect attempt at that answer Number pH

Explanation / Answer

Ksp of Al(OH)3 = 3×10-34 = [Al+3] [OH-]^3

Ksp of Pb(OH)2 = 1.43×10-20 = [Pb+2] [OH-]^2

For Al[OH]3

we have Al+3 from given data

Substituting

[OH-] = 8.7358*10^-12 M

pOH = -log [OH-] = 11.0587

pH = 14- pOH = 2.9413

For Pb(OH)2

Pb+2 = 0.21 M

[OH-] = 2.6*10^-10 M

pOH = 9.583

pH = 14 - pOH = 4.416

pH range

2.9413 < pH < 4.416

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