A 1.250 g sample of bauxite (the primary ore of aluminum) was analyzed for aluminum. The sample waspowderized and treated in concentrated nitric acid. The nitric acid was removed and solids were treated inhot water with added nitric acid. Insoluble solids were removed by gravity filtration. The solution wasmade basic by the slow addition of dilute ammonia forming the gelatinous precipitate (Al(OH), andAl,O,.x H2O). The precipitate was heated to coagulate it then filtered over filter paper. The paper andsolids were placed in a porcelain crucible and the paper was ashed while the precipitate was ignited at600°C to convert the precipitate to pure Al,O,. The mass of Al,O, recovered was 0.2890 g. The averagemass of ash after charring 10 sheets of the identical filter paper was 0.0007 g. Calculate the percentaluminum in the bauxite ore sample.

Given: Weight of sample of bauxite = 1.250 g Mass of Al2O3 recovered =0.2890 g Mass of Ash = 0.0007…

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

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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