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

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter2: Chemical Formulas, Equations, And Reaction Yields

Section: Chapter Questions

Problem 9P: Fulgurites are the products of the melting that occurs when lightning strikes the earth. Microscopic...

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