=0.0028 mole/L
That's good, but I would not round the answer off so much, since this is an analytical lab. Three significant digits is 0.00284 M and four significant digits is 0.002839 M.
2.a.Volume of Iodine (I2) added
=50 ml - 12.35 ml
= 37.65 ml
I got the impression that the numbers below were the actual volumes, but if the buret starts with 50 mL at the top and these are actually the readings from the buret, then that is right, you would subtract each number from 50 mL to obtain the volume of iodine solution added. Burets are normally the other way with 0 at the top and 50 mL at the bottom. That way, the reading from the buret is the volume delivered and you don't have to always subtract the reading from 50. But the procedure says to refill the buret "back to the 50.00 mL mark," which indicates the 50 is at the top. Does the results printout specify if the numbers such as 12.40 mL are buret readings or actual volumes? This is an important point, so we want to get it right.
12.40 mL just changed color
12.35 mL just changed color
12.35 mL just changed color
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