State what is the ppm of water in the ethanol sample

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Reference no: EM13173598

The KF method is a secondary coulometric coulometric analysis that utilizes the generation of I2/I3 -1 from the iodide ion. This then reacts with water in a complicated redox involving stinky pyridine...hence, the advantage of doing this by remote control under a hood. The limiting reagent is the water: one mole of the generated I3 -1 reacts with one mole of water. The goal of the experiment was to find the ppm of water in a 250 ml sample of "pure" ethanol, CH3CH2OH (density of 0.7893 g/ml). A current of 10.0 milliamps was run for 289.4 sec, until the blue black color of the starch was observed. However, the current generator box was only 89.3% current efficient, losing some current. The production of the tri-iodide ion was by the same oxidation reaction as in our lab. What is the ppm of water in the 250 ml ethanol sample?

Reference no: EM13173598

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