chemistry experiments

Low-pressure extraction of alkaloids from oxidized Coffea arabica seeds with an emulsified colloid of liquid butterfat globules dispersed within a water-based solution. Very successful experiment. I hope I can replicate this.

First trial of an experiment for Honors Biology. Students develop a standard curve of changes in mass of uncooked potato slices in response to various concentrations of solute (either salt or sugar). A little surprising that the change leveled off so much on the upper end of the salt concentration series. Any thoughts out there?

All in all a fun and easy experiment.