Microscale Crystallization-Craig Tube free essay sample

We then took the crystals out to try on a pre weigh watch glass (52. 994g) to dry. After drying the watch glass with crystal was weigh 52. 1602g. It was found that the pure sulfanilamide recovery was . 0608 with a percent recovery of . 3944. Using the melting machine it was found that impure sulfanilamide had a melting point of 172 C and pure sulfanilamide had a melting point of 165. 1 C. When comparing the boiling point of sulfanilamide to the actual boiling point (165-166 C) the experiment was right on. Comparing the boiling point of impure and pure sulfanilamide the impure had more substances in it so the boiling point was higher than the pure. Actual Melting Point165-166C Questions Page 32 1. The crystallization for this experiment may have failed due to many factors such as having very little mother liquor present or the crystals were just impure, in this case, you might have to redo the experiment. We will write a custom essay sample on Microscale Crystallization-Craig Tube or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Another reason may be that the cooling process occurred too rapidly. What I would do at this point is try to induce crystallization by swirling the liquid so it touches the side of what you are using. What this does is pushes what may have evaporated and dried onto the side of your flask back into the solution. These small amounts would provide â€Å"seed crystals† which could induce crystallization. Another method would be to add a small amount of your original material into your cooled solution, which may also start crystallization- this method, is called seeding.