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Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter8: Thermochemistry
Section: Chapter Questions
Problem 65QAP: Natural gas companies in the United States use the therm as a unit of energy. One therm is 1105 BTU....
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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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