Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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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