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A liquid-liquid extraction was performed by a student to remove caffeine from a freshly brewed pot of coffee. In the separatory funnel, the student added the coffee and extracted the caffeine using dichloromethane (d = 1.33g/mL). After shaking and venting, two layers formed, the student then proceeded to drain the bottom layer into a flash labeled flask #1. Which of the following is the best explanation as to what the student should do next?
Discard the contents of flask #1 as it does not contain the product, instead add the remaining liquid in the separatory funnel to a new flask and proceed to extract the caffeine.
Add a drying agent to flask #1, filter, then evaporate to obtain solid caffeine.
Add acid to the remaining contents in the separatory funnel, then add to a new flask
Add water to flask # 1 and evaporate
In general, for an acid or base liquid-liquid extraction we generate some type of salt. We take advantage of the fact that this salt is ____ soluble in the water because it is ____.
less, polar
less, nonpolar
more, nonpolar
more, polar
Under these conditions, the half-life of the reaction has been estimated to be 6.4 103 min. What would the half-life be if the initial concentration of NO were 13 ppm?
the compound is found to be 13.068% C and 86.932% Br. What is the molecular formula of the compound?
a 0.6407 g sample containing chloride and iodide ions gave a silver halide precipitate weighing 0.4430 g. this
the volume of blood in the body of a certain deep-sea diver is about 5.63 l. blood cells make up about 55 of the blood
in photosynthesis plants use energy from the sun in combination with carbon dioxide and water to form glucose c6h12o6
A stock solution of capsaicin in HPLC grade ethanol is provided. 65% capsaicin 35% dihydrocapsaicin. Calculate the concentration of your stock solution in ppm. The density of methanol = .791g/mL.
what do the bond angles of water suggest about the hybridization state of the oxygen atom of water?
Three helium nuclei fuse together, forming one carbon nucleus. The mass of carbon is less than three times the mass of helium. When helium fuses into carbon, which of the following occurs
0.0010 mg of H, 0.0116 mg of C, and 0.0310 mg of O. It was also determined that the unknown compound had a molecular weight of 90.0 g/mol.
Zn is immersed in a solution of CuCl2. What is the reaction and at what activity ratio of Zn(2+) / Cu (2+) will the reaction stop
Draw one energy diagram showing both reaction pathways & label all transition states, intermediates and products as well as activation energies.
write three dimensional structures of meso-stilbene dibromide and one enantiomer of dl-stilbene dibromide
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