Suitable treatment of a 1.579 g soil sample converts all arsenic to AsO4³-. 50.00 mL of 0.07 M Agt was added to form Ag3AsO4 precipitate. The excess Ag+ was back-titrated with 38.97 mL of 0.021 M SCN to reach the equivalence point Ag+SCN → AgSCN(s) Solve for the % As (MW - 74.92 g/mol) in the sample. Question 26 A 0.98 g sample containing Cu (63.546 g/mol) is analyzed by reducing copper(II) to copper (1) by the reaction of iodide ions. 2Cu²+ +41 2Cul + 1₂ The sample required 18 mL of 0.1000 M Na2S2O3 to react to all the liberated 12 completely. 25203² + 1221 +S406²- What is the %Cu in the sample?

Suitable treatment of a 1.579 g soil sample converts all arsenic to AsO4³-. 50.00 mL of 0.07 M Agt was added to form Ag3AsO4 precipitate. The excess Ag+ was back-titrated with 38.97 mL of 0.021 M SCN to reach the equivalence point Ag+SCN → AgSCN(s) Solve for the % As (MW - 74.92 g/mol) in the sample. Question 26 A 0.98 g sample containing Cu (63.546 g/mol) is analyzed by reducing copper(II) to copper (1) by the reaction of iodide ions. 2Cu²+ +41 2Cul + 1₂ The sample required 18 mL of 0.1000 M Na2S2O3 to react to all the liberated 12 completely. 25203² + 1221 +S406²- What is the %Cu 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

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Suitable treatment of a 1.579 g soil sample converts all arsenic to AsO4³-. 50.00
mL of 0.07 M Ag+ was added to form Ag3AsO4 precipitate. The excess Ag+ was
back-titrated with 38.97 mL of 0.021 M SCN to reach the equivalence point
Ag+SCN → AgSCN (s)
Solve for the % As (MW = 74.92 g/mol) in the sample.
Question 26
A 0.98 g sample containing Cu (63.546 g/mol) is analyzed by reducing copper(II)
to copper (1) by the reaction of iodide ions.
2Cu²++41 2Cul + 12
The sample required 18 mL of 0.1000 M Na2S2O3 to react to all the liberated 12
completely.
25203² + 1221 +S406²-
What is the %Cu in the sample?

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