27. Dissolved dioxygen in water samples can be determined by the following equations: 2MNSO4(aq) + 4NAOH(aq) + O2(g) → 2MNO2(s) + 2Na2SO4(aq) + 2H2OM 2MNO2(s) + 2H2SO4(aq) + 2Nal(aq) → MNSO4(aq) + I2(aq) + NazSO4(aq) + 2H2O» I2{aq) + 2Na2S2O3(aq) → NazS4O6(aq) + 2Nal(aq) A water sample from the local river was treated according to the first two equations above. Exactly 200.00 mL of this treated water required 8.32 mL of 0.0250 M Na:S2O3 to titrate to the endpoint. Calculate the concentration of dissolved oxygen in the water sample. A) 1.04 x 10°M B) 2.08 x 10“M C) 5.20 x 10 M D) 8.67 x 10"M E) 4.33 x 10"M

27. Dissolved dioxygen in water samples can be determined by the following equations: 2MNSO4(aq) + 4NAOH(aq) + O2(g) → 2MNO2(s) + 2Na2SO4(aq) + 2H2OM 2MNO2(s) + 2H2SO4(aq) + 2Nal(aq) → MNSO4(aq) + I2(aq) + NazSO4(aq) + 2H2O» I2{aq) + 2Na2S2O3(aq) → NazS4O6(aq) + 2Nal(aq) A water sample from the local river was treated according to the first two equations above. Exactly 200.00 mL of this treated water required 8.32 mL of 0.0250 M Na:S2O3 to titrate to the endpoint. Calculate the concentration of dissolved oxygen in the water sample. A) 1.04 x 10°M B) 2.08 x 10“M C) 5.20 x 10 M D) 8.67 x 10"M E) 4.33 x 10"M

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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