The arsenic in a 2.345g sample of a pesticide was converted to H 3 AsO4 by suitable treatment.The acid was then neutralized, and 60.00 ml of 0.06781M AgNO 3 was added to precipitate thearsenic quantitatively as Ag 3 AsO4. The excess Ag+ in the filtrate and washings from theprecipitate was titrated with 15.27 ml of 0.123 M KSCN; the reaction wasAg+ + SCN- → AgSCN(s)Calculate the percentage As 2 O 3 in the sample.

Molarity is defined as the number of moles of solute per litre of the solution. It is denoted as M.…

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Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter4: Reactions In Aqueous Solution

Section: Chapter Questions

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The arsenic in a 2.345g sample of a pesticide was converted to H 3 AsO4 by suitable treatment.
The acid was then neutralized, and 60.00 ml of 0.06781M AgNO 3 was added to precipitate the
arsenic quantitatively as Ag 3 AsO4. The excess Ag+ in the filtrate and washings from the
precipitate was titrated with 15.27 ml of 0.123 M KSCN; the reaction was
Ag+ + SCN- → AgSCN(s)
Calculate the percentage As 2 O 3 in the sample.

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