The arsenic in a 1.203 g sample of a pesticide was converted to H3AsO4 by reaction with concentrated nitric acid. The acid was then neutralized, and 40.00 mL of 0.05871 M AgNO3 was added to precipitate the arsenic quantitatively as silver arsenate, Ag3AsO4 (FM 462.52 g/mol) 3 Ag+ + AsO43-→ Ag3AsO4 (s) The excess Ag in the filtrate and in the washings from the precipitate was titrated with 9.63 mL of 0.1000 M KSCN.Ag+ + SCN-→ AgSCN (s)Find the weight percent of arsenic trioxide, As2O3 (FM 197.841 g/mol), in the sample.
The arsenic in a 1.203 g sample of a pesticide was converted to H3AsO4 by reaction with concentrated nitric acid. The acid was then neutralized, and 40.00 mL of 0.05871 M AgNO3 was added to precipitate the arsenic quantitatively as silver arsenate, Ag3AsO4 (FM 462.52 g/mol) 3 Ag+ + AsO43-→ Ag3AsO4 (s) The excess Ag in the filtrate and in the washings from the precipitate was titrated with 9.63 mL of 0.1000 M KSCN.Ag+ + SCN-→ AgSCN (s)Find the weight percent of arsenic trioxide, As2O3 (FM 197.841 g/mol), in the sample.
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
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The arsenic in a 1.203 g sample of a pesticide was converted to H3AsO4 by reaction with
concentrated nitric acid. The acid was then neutralized, and 40.00 mL of 0.05871 M AgNO3 was added
to precipitate the arsenic quantitatively as silver arsenate, Ag3AsO4 (FM 462.52 g/mol)
3 Ag+ + AsO43-→ Ag3AsO4 (s)
The excess Ag in the filtrate and in the washings from the precipitate was titrated with 9.63 mL of
0.1000 M KSCN.Ag+ + SCN-→ AgSCN (s)Find the weight percent of arsenic trioxide, As2O3 (FM 197.841 g/mol), in the sample.
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