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A 1.250 g sample of bauxite (the primary ore of aluminum) was analyzed for aluminum. The sample was powderized and treated in concentrated nitric acid. The nitric acid was removed and solids were treated in hot water with added nitric acid. Insoluble solids were removed by gravity filtration. The solution was made basic by the slow addition of dilute ammonia forming the gelatinous precipitate (Al(OH), and AIĻO.x H2O). The precipitate was heated to coagulate it then filtered over filter paper. The paper and solids were placed in a porcelain crucible and the paper was ashed while the precipitate was ignited at 600°C te convet the precinitote to nure ALO The moss of ALO recOvered wos 0 2800 c The ovee

A 1.250 g sample of bauxite (the primary ore of aluminum) was analyzed for aluminum. The sample was powderized and treated in concentrated nitric acid. The nitric acid was removed and solids were treated in hot water with added nitric acid. Insoluble solids were removed by gravity filtration. The solution was made basic by the slow addition of dilute ammonia forming the gelatinous precipitate (Al(OH), and AIĻO.x H2O). The precipitate was heated to coagulate it then filtered over filter paper. The paper and solids were placed in a porcelain crucible and the paper was ashed while the precipitate was ignited at 600°C te convet the precinitote to nure ALO The moss of ALO recOvered wos 0 2800 c The ovee

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter21: Chemistry Of The Main-group Elements
Section: Chapter Questions
Problem 21.195QP
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A 1.250 g sample of bauxite (the primary ore of aluminum) was analyzed for aluminum. The sample was powderized and treated in concentrated nitric acid. The nitric acid was removed and solids were treated in hot water with added nitric acid. Insoluble solids were removed by gravity filtration. The solution was made basic by the slow addition of dilute ammonia forming the gelatinous precipitate (Al(OH), and Al,O,.x H2O). The precipitate was heated to coagulate it then filtered over filter paper. The paper and solids were placed in a porcelain crucible and the paper was ashed while the precipitate was ignited at 600°C to convert the precipitate to pure Al,O,. The mass of Al,O, recovered was 0.2890 g. The average mass of ash after charring 10 sheets of the identical filter paper was 0.0007 g. Calculate the percent aluminum in the bauxite ore sample.
Transcribed Image Text:A 1.250 g sample of bauxite (the primary ore of aluminum) was analyzed for aluminum. The sample was powderized and treated in concentrated nitric acid. The nitric acid was removed and solids were treated in hot water with added nitric acid. Insoluble solids were removed by gravity filtration. The solution was made basic by the slow addition of dilute ammonia forming the gelatinous precipitate (Al(OH), and Al,O,.x H2O). The precipitate was heated to coagulate it then filtered over filter paper. The paper and solids were placed in a porcelain crucible and the paper was ashed while the precipitate was ignited at 600°C to convert the precipitate to pure Al,O,. The mass of Al,O, recovered was 0.2890 g. The average mass of ash after charring 10 sheets of the identical filter paper was 0.0007 g. Calculate the percent aluminum in the bauxite ore sample.
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