I just had a lab, and the results really aren't adding up to what i expected. And this is specifically about simple distillation, not fractional distillation. Lets say i have a solution of two liquids, one's boiling point is 90°C and the other is 110°C, a 20°C difference which is pretty close. So i heat up the plate, and that flask heats up to hot enough to boil, then the vapor reaches the thermometer and lets say it reads between 85°C - 95°C the entire process. Questions: Now, heres what im not sure about. I'm thinking even though the temperature on the thermometer on top of the flask is between 85°C - 95°C, i'm pretty sure if i measured the temperature of the boiling liquid in the flask directly, it would be more than 95°C. Is this true? I'm pretty sure this is true because during the lab, the thermometer read well below the lowest boiling point and i was still collecting liquid in the collection vial. 2nd question, will i have any of the 110°C compound go into the collection vial? For compounds that have very different boiling points, the answer is no (or at least i'm pretty sure). But for close boiling points, if my 1st idea is correct, then that might mean theres a chance of the 110°C compound going into the collection vial in small amounts (i think?) If this is possible, can someone explain to me how this is happening?