A 0.8965g ore sample is dissolved in nitric acid and then filtered. The aluminum is present in solution as AP. The solution is made basic with ammonium hydroxide, NH.OH, and the aluminum hydroxide, Al(OH): (FW 78.004), precipitates. This gel is filtered in a porous glass crucible, rinsed with dilute ammonium hydroxide, ignited, cooled in a desiccator, and weighed. The resulting alumina, Al:O; (FW 101.94), weighed 0.1605 g. Why is the solution filtered after acid dissolution? Why rinse with ammonium hydroxide sohution? What chemical transformation takes place during ignition? (Show the balanced chemical equation) Why use a desiccator during cooling? Calculate the weight percent Al (AW 26.9815) in the sample. Al(OH), -> Al:O, + H;o

A 0.8965g ore sample is dissolved in nitric acid and then filtered. The aluminum is present in solution as AP. The solution is made basic with ammonium hydroxide, NH.OH, and the aluminum hydroxide, Al(OH): (FW 78.004), precipitates. This gel is filtered in a porous glass crucible, rinsed with dilute ammonium hydroxide, ignited, cooled in a desiccator, and weighed. The resulting alumina, Al:O; (FW 101.94), weighed 0.1605 g. Why is the solution filtered after acid dissolution? Why rinse with ammonium hydroxide sohution? What chemical transformation takes place during ignition? (Show the balanced chemical equation) Why use a desiccator during cooling? Calculate the weight percent Al (AW 26.9815) in the sample. Al(OH), -> Al:O, + H;o

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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Question

A 0.8965g ore sample is dissolved in nitric acid and then filtered. The aluminum is present in solution
as AP". The solution is made basic with ammonium hydroxide, NH,OH, and the aluminum hydroxide,
Al(OH)» (FW 78.004), precipitates. This gel is filtered in a porous glass crucible, rinsed with dilute
ammonium hydroxide, ignited, cooled in a desiccator, and weighed. The resulting alumina, Al;O; (FW
101.94), weighed 0.1605 g.
Why is the solution filtered after acid dissolution?
Why rinse with ammonium hydroxide solution?
What chemical transformation takes place during ignition? (Show the balanced chemical
equation)
• Why use a desiccator during cooling?
Calculate the weight percent Al (AW 26.9815) in the sample.
Al(OH)) -> Al;O, + H0

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