1. The problem statement, all variables and given/known data I am working on an experiment rite up for a physical chem class regarding the n-Hexane/Acetone azetrope. I have done my calcs, tripple checked both the data and the clacs and everything is as correct as it can be at this point (i cant change figures recorded in the lab notes and just have to work with it as is) the problem is that none of the lines connect to where i can definitively point out the azeotrope (see image)https://www.dropbox.com/s/v0bqszxdatqcfhg/expt3.jpg...I understand the azetrope would be at the minimum where, theoretically, these plots should over lap. What would you do in this case? 2. Relevant equations 3. The attempt at a solution I suppose it is worth mentioning that this was a 2 man group project, partner did the stuff on the right side in blue so I have no way of really knowing what happened in his lab. All I can say is that for mine portion I was very careful to record temps twice, calibrate the thermocoupler twice for consistency and always used the same instrument when reading the Refractive index. there where 4 instruments in all so if the partner used a combo of them, didnt wait for the sample to cool first, these could all through off the R.I. which is why the round points for Y(hexane)' are off and if he had calibrated the thermo coupler corectly maybe his temps would be a degree or so lower to where they would match mine. again any advice on how to accuratley predict the azeotrope would be of great help. Also, how does one correctly discuss an azetrope in literature? Would you say an "the azeotrope occurs at aprox. mole fraction of 0.48 with a boiling point of..."