The arsenic in a 1.223-g sample of a pesticide was converted to H3AsO4 by suitable treatment. The acid was then neutralized, as 40.00 mL 0.07891 M AgNO3 was added to precipitate the arsenic quantitatively as Ag3AsO4. The excess Ag+ in the filtrate and washings from the precipitate was titrated with 11.27 mL of 0.1000 M KSCN; the reaction was Ag+ + SCN- → AgSCN(s)Calculate the percent As2O3 in the sample.

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Answered: The arsenic in a 1.223-g sample of a…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter13: Titrations In Analytical Chemistry

Section: Chapter Questions

Problem 13.22QAP

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The arsenic in a 1.223-g sample of a pesticide was converted to H₃AsO₄ by suitable treatment. The acid was then neutralized, as 40.00 mL 0.07891 M AgNO₃was added to precipitate the arsenic quantitatively as Ag₃AsO₄. The excess Ag⁺ in the filtrate and washings from the precipitate was titrated with 11.27 mL of 0.1000 M KSCN; the reaction was

Ag⁺ + SCN^- → AgSCN(s)

Calculate the percent As₂O₃ in the sample.

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