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Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter3: Chemical Reactions
Section3.9: Classifying Reactions In Aqueous Solution
Problem 1RC: 1. Sometimes a reaction can fall in more than one category. Into what category (or categories) does...
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Aluminum is precipitated (initially) as Al(OH)3, then dried and ignited to Al2O3. Consider the reactions below and answer the following questions. Al(OH)3(s) <==> Al*³(aq) + 3 OH (aq) 1+3, Keg = 3.0 x 10 34 Al**(aq) + 4 OH (aq) <==> Al(OH)4 (aq) Keg = 33 a) What problem(s) might arise in precipitating Al*3 from solution using NaOH as the precipitating agent-particularly if an excess of the hydroxide is used? b) How is this possible danger minimized by using aqueous NH3 as the precipitating agent?
Transcribed Image Text:Aluminum is precipitated (initially) as Al(OH)3, then dried and ignited to Al2O3. Consider the reactions below and answer the following questions. Al(OH)3(s) <==> Al*³(aq) + 3 OH (aq) 1+3, Keg = 3.0 x 10 34 Al**(aq) + 4 OH (aq) <==> Al(OH)4 (aq) Keg = 33 a) What problem(s) might arise in precipitating Al*3 from solution using NaOH as the precipitating agent-particularly if an excess of the hydroxide is used? b) How is this possible danger minimized by using aqueous NH3 as the precipitating agent?
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