oxidation reduction titration

oxidation reduction titration - If we has just read the...

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Reanna Echeverria 10/26/2011 CHEM 111L Oxidation- Reduction Titration Reflection The percent oxalate by mass in my unknown was 47.8%. My unknown was potassium oxide: K 2 C 2 O 4 x H 2 O. What was done in the experiment was: sodium oxalate, water, and sulfuric acid were heated to a near boil, then titrated with permanganate solution while hot. Endpoint was reached at a light pink. The experiment was repeated with an unknown oxalate. The percent by mass in my unknown was 47.8% (actual), but the calculation I received was 51.07%. Either misreading numbers, false calculations, or the human error could have caused my fluctuation.
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Unformatted text preview: If we has just read the buret to only 1 decimal place and the balance to 2 decimal places then the calculations at the end result could be very different than the actual because you are missing significant figures, which account for a great deal of accuracy. For example if you were multiplying .74999 x .15000 the answer would be .11250 and if you had rounded that to just one decimal place you would have .7 x .2 which would be .14 which is .0275 off! That is 25% of the actual answer! –Which proves that ignoring significant figures and improperly rounding can cause big consequences....
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