The quantity of dissolved oxygen (DO) in natural waters is an essential parameter for
Chapter 4, Problem 4.142(choose chapter or problem)
The quantity of dissolved oxygen (DO) in natural waters is an essential parameter for monitoring survival of most aquatic life. DO is affected by temperature and the amount of organic waste. An earlier method for determining DO involved a two-step process: 1. The water sample is treated with KI, O2(aq) 1 4KI(aq) 1 2H2SO4(aq) - 2I2(aq) 1 2H2O(l) 1 2K2SO4(aq) 2. The I2 is titrated with sodium thiosulfate, I2(aq) 1 2Na2S2O3(aq) - Na2S4O6(aq) 1 2NaI(aq) A 50.0-mL water sample is treated with KI, and then 15.75 mL of 0.0105 M Na2S2O3 is required to reach the end point. (a) Which substance is oxidized in step 1, and which is reduced in step 2? (b) What mass (g) of O2 is dissolved in the water sample?
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