Monday, April 7, 2008

Who Dun It, Pt 2

Continuing with the Cafeteria Caper, we need to determine if the culprit is a member of the Philophiles, a club of science geeks who revere Philo T. Farnsworth. The club website explained that the initiation ceremony requires each initiate to eat raw liver and drink a large quantity of soda. So we will be interested in determining if the "stomach contents" found at the crime scene contains liver and soda.

All labs will run control experiments with known substances before examining unknowns, in this case the "stomach contents". This is what we did today.
Prior to the lab, Noach and I prepared the monosaccharide, disacharide and polysaccharide solutions. We did not want to make the full 700ml solution as described so we had to figure out how much solute to add to 150ml distilled water.Then we had to measure and add.We used Benedict's indicator to show the presence of monosaccharides. The light blue indicator turned orange, test tube #2, in a large amount of monosaccharide after warming in a hot water bath.
Iodine, normally orange or brown, turns black in the presence of polysaccharides, test tube #4.

We did not complete all of the control tests this week. We will finish next week and do the "stomach contents" then.PRM

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