True or False, according to the lab syllabus, there are three times in the lab w

Question

True or False, according to the lab syllabus, there are three times in the lab when googles can be removed without penalty: to read thermometers during a distillation to read a thermometer during a m.p. recording. to wipe sweat from them True False Dr. Goodchem found a substance in the lab labeled Orange extract. He keenly realized that he could extract Citral from the extract. Therefore, Dr. Goodchem took 10.01 grams of the Orange Extract and performed a steam distillation. At the end of the distillation. Dr. Goodchem observed that he had extracted 5.5 mL of Citral. If the density of pure Citral is 0.888 g/mL, what was the % composition of Citral found in the Orange extract. Methylene Chloride is water soluble. True False

Explanation / Answer

Q3 false

explanation - -Although DCM is polar and relatively small, its solubility in water is low because it lacks the ability to hydrogen bond. The layering of solvents is dependent upon density. The more dense solvent will be on the bottom. Commonly the organic solvent is on top, but in the case of DCM in aqueous solution it is on the bottom because it is more dense than water.

Damico...you're correct that DCM is soluble in water, but for practical purposes it is not soluble in water. DCM's solubility in water is quite low and is capable of being used in separations from aqueous solution. It is also true that oil is soluble in water, but the solubility is very very low. Everything is soluble to an extent. I would never pour oil into drinking water, separate and then drink the water. Some oil will remain, but for purposes of separation we consider DCM to be insoluble.

Q1 ----- http://www.chemistry.mcmaster.ca/~ayers/chem2PA3/labs/SAFETY.pdf

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