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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

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter21: Chemistry Of The Main-group Elements
Section: Chapter Questions
Problem 21.171QP
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27. Dissolved dioxygen in water samples can be determined by the following equations: 2MNSO4(aq) + 4NAOH(aq) + O2(g) → 2MNO2(s) + 2Na,SO4(ag) + 2H2O) 2MNO2(s) + 2H2SO4(aq) + 2Nal(ag) → MNSO4(aq) + I2(aq) + NazSO4(aq) + 2H2O) I2(aq) + 2N22S2O3(aq) → N22S4O6(aq) + 2Nal(ag) 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 10M C) 5.20 x 104M D) 8.67 x 107M E) 4.33 x 10"M
Transcribed Image Text:27. Dissolved dioxygen in water samples can be determined by the following equations: 2MNSO4(aq) + 4NAOH(aq) + O2(g) → 2MNO2(s) + 2Na,SO4(ag) + 2H2O) 2MNO2(s) + 2H2SO4(aq) + 2Nal(ag) → MNSO4(aq) + I2(aq) + NazSO4(aq) + 2H2O) I2(aq) + 2N22S2O3(aq) → N22S4O6(aq) + 2Nal(ag) 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 10M C) 5.20 x 104M D) 8.67 x 107M E) 4.33 x 10"M
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