1. As(III) can be determined gravimetrically as As2S3. The weight of As2S3 obtained from a 0.5000 g sample is 0.3152 g. Calculate the percentage of arsenic acid (HOASO2) in the sample. (As = 74.92160, S = 32.06, O = 15.999, H = 1.008 g/mol) 2. An iron ore was analyzed by dissolving a 1.1324-g sample in concentrated HCl. The resulting solution was diluted with water, and the iron(III) was precipitated as the hydrous oxide Fe203 XH2O by addition of NH3. After filtration and washing, the residue was ignited at a high temperature to give 0.5394 g of pure Fe2O3 (159.69 g/mol). Calculate the %Fe304 (231.54 g/mol) and its G.F in the sample. [Hints: 6 Fe,O, - 4 Fe,O, +0,1

1. As(III) can be determined gravimetrically as As2S3. The weight of As2S3 obtained from a 0.5000 g sample is 0.3152 g. Calculate the percentage of arsenic acid (HOASO2) in the sample. (As = 74.92160, S = 32.06, O = 15.999, H = 1.008 g/mol) 2. An iron ore was analyzed by dissolving a 1.1324-g sample in concentrated HCl. The resulting solution was diluted with water, and the iron(III) was precipitated as the hydrous oxide Fe203 XH2O by addition of NH3. After filtration and washing, the residue was ignited at a high temperature to give 0.5394 g of pure Fe2O3 (159.69 g/mol). Calculate the %Fe304 (231.54 g/mol) and its G.F in the sample. [Hints: 6 Fe,O, - 4 Fe,O, +0,1

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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