Asp 101 Ksp for Al(OH)3=4.6×10-33 a. Please determine the [OH-] required to initiate precipitation of copper (II) hydroxide, Cu(OH)2, from the solution. Give your answer with 3 sig figs. b. Please determine the [OH-] required to initiate precipitation of aluminum hydroxide, Al(OH)3, from the solution. Give your answer with 3 sig figs. c. If you slowly add in OH (aq) to the solution mentioned at the beginning the problem 5, will aluminum hydroxide or copper (II) hydroxide precipitate first? How do you know? d. What is the concentration (M) of Al³+ in solution when Cu(OH)2 begins to precipitate? Give your answer with 3 sig figs. e. Is it possible to precipitate 99% of the aluminum as Al(OH)3 before precipitation of Cu(OH)2 begins? Show your calculations.
Asp 101 Ksp for Al(OH)3=4.6×10-33 a. Please determine the [OH-] required to initiate precipitation of copper (II) hydroxide, Cu(OH)2, from the solution. Give your answer with 3 sig figs. b. Please determine the [OH-] required to initiate precipitation of aluminum hydroxide, Al(OH)3, from the solution. Give your answer with 3 sig figs. c. If you slowly add in OH (aq) to the solution mentioned at the beginning the problem 5, will aluminum hydroxide or copper (II) hydroxide precipitate first? How do you know? d. What is the concentration (M) of Al³+ in solution when Cu(OH)2 begins to precipitate? Give your answer with 3 sig figs. e. Is it possible to precipitate 99% of the aluminum as Al(OH)3 before precipitation of Cu(OH)2 begins? Show your calculations.
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 84QRT
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Question
![5. A solution contains 0.10 M Cu²+ and 0.0010 M A1³+. Consider the addition of hydroxide ion
as a selective precipitation agent:
Ksp for Cu(OH)2 =1.6×10-¹⁹
Ksp for Al(OH)3 = 4.6×10-33
a. Please determine the [OH-] required to initiate precipitation of copper (II) hydroxide,
Cu(OH)2, from the solution. Give your answer with 3 sig figs.
b. Please determine the [OH-] required to initiate precipitation of aluminum hydroxide,
Al(OH)3, from the solution. Give your answer with 3 sig figs.
c. If you slowly add in OH (aq) to the solution mentioned at the beginning the problem
5, will aluminum hydroxide or copper (II) hydroxide precipitate first? How do you
know?
d. What is the concentration (M) of Al³+ in solution when Cu(OH)2 begins to precipitate?
Give your answer with 3 sig figs.
e. Is it possible to precipitate 99% of the aluminum as Al(OH)3 before precipitation of
Cu(OH)2 begins? Show your calculations.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fef179162-973e-41f0-bb3a-1bfb38a065ce%2F47005659-fc5f-4fa6-9a45-a1fa725da6f4%2Fyczyp6_processed.jpeg&w=3840&q=75)
Transcribed Image Text:5. A solution contains 0.10 M Cu²+ and 0.0010 M A1³+. Consider the addition of hydroxide ion
as a selective precipitation agent:
Ksp for Cu(OH)2 =1.6×10-¹⁹
Ksp for Al(OH)3 = 4.6×10-33
a. Please determine the [OH-] required to initiate precipitation of copper (II) hydroxide,
Cu(OH)2, from the solution. Give your answer with 3 sig figs.
b. Please determine the [OH-] required to initiate precipitation of aluminum hydroxide,
Al(OH)3, from the solution. Give your answer with 3 sig figs.
c. If you slowly add in OH (aq) to the solution mentioned at the beginning the problem
5, will aluminum hydroxide or copper (II) hydroxide precipitate first? How do you
know?
d. What is the concentration (M) of Al³+ in solution when Cu(OH)2 begins to precipitate?
Give your answer with 3 sig figs.
e. Is it possible to precipitate 99% of the aluminum as Al(OH)3 before precipitation of
Cu(OH)2 begins? Show your calculations.
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VIEWStep 2: (a) Calculation of concentration of hydroxide ion to precipitate out copper(II) hydroxide.
VIEWStep 3: (b) Calculation of concentration of hydroxide ion to precipitate out aluminium hydroxide.
VIEWStep 4: (c) Determination of which will precipitate out first.
VIEWStep 5: (d) Calculation of aluminum ion in the solution when the precipitation of the copper hydroxide start
VIEWStep 6: (e) Determination of whether 99 % of aluminum can be precipitated out or not
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