low, ) Nitrite (N07) can be determined by oxidation with excess Ce**, followed by back titration of the unreacted Ce*. A 4.030 g sample of solid containing a mixture of only NaNO2 (68.995 g/mol) and NaNO3 (84.995 g/mol) was dissolved in 500.0 mL. A 25.00 mL sample of this solution was treated with 50.00 mL of 0.1186 M Ce** in strong acid for 5 min, and the excess Ce** was back-titrated with 31.13 mL of 0.04289 M ferrous ammonium sulfate (FeSO,). The relevant redox chemistry is shown below. 2Ce*+ + NOz + H,0 → 2Ce** + NO5 + 2H* Ce** + Fe2+ → Ce3+ + Fe³+ Calculate the weight percent of NANO, and NaNO, in the solid. A solution of unknown concentration of TI* gave a poloragraphic signal of 10.0 µA. When 1.00 mL of 0.0500 M standard was added to 100.0 mL of the TI* unknown solution, the signal increased to 14.0 µA. Find the concentration of TI* in the unknown.

low, ) Nitrite (N07) can be determined by oxidation with excess Ce**, followed by back titration of the unreacted Ce. A 4.030 g sample of solid containing a mixture of only NaNO2 (68.995 g/mol) and NaNO3 (84.995 g/mol) was dissolved in 500.0 mL. A 25.00 mL sample of this solution was treated with 50.00 mL of 0.1186 M Ce in strong acid for 5 min, and the excess Ce was back-titrated with 31.13 mL of 0.04289 M ferrous ammonium sulfate (FeSO,). The relevant redox chemistry is shown below. 2Ce+ + NOz + H,0 → 2Ce** + NO5 + 2H* Ce** + Fe2+ → Ce3+ + Fe³+ Calculate the weight percent of NANO, and NaNO, in the solid. A solution of unknown concentration of TI* gave a poloragraphic signal of 10.0 µA. When 1.00 mL of 0.0500 M standard was added to 100.0 mL of the TI* unknown solution, the signal increased to 14.0 µA. Find the concentration of TI* in the unknown.

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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