2. The arsenic in a 1.203-g sample of a pesticide was converted to H3ASO4 by suitable treatment. The acid was then neutralized, and 40.00 mL of 0.05871 M AgNO3 was added to precipitate the arsenic quantitatively as Ag-AsO4. The excess Ag* in the filtrate and in the washings from the precipitate was titrated with 9.63 mL of 0.1000 M KSCN, and the reaction was Ag+ SCN → AgSCN(s). Find the percentage of As in the sample.
2. The arsenic in a 1.203-g sample of a pesticide was converted to H3ASO4 by suitable treatment. The acid was then neutralized, and 40.00 mL of 0.05871 M AgNO3 was added to precipitate the arsenic quantitatively as Ag-AsO4. The excess Ag* in the filtrate and in the washings from the precipitate was titrated with 9.63 mL of 0.1000 M KSCN, and the reaction was Ag+ SCN → AgSCN(s). Find the percentage of As in the sample.
Chapter13: Titrations In Analytical Chemistry
Section: Chapter Questions
Problem 13.22QAP
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