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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
At what rate in drops per minute should a dose of 23 mcg/kg/min of dopamine be administered to a 60 kg patient using a solution containing dopamine, 1,109 mcg/mL and a drip set that delivers 56 drops/mL (round to the nearest drop/min)
devise a reaction scheme to make ethanol from propanoic acid. several steps may be required. for each reaction include
Consider the following specific heats: copper, 0.384 J/g.oC; lead, 0.159 J/g.oC; water, 4.18 J/g.oC; glass, 0.502 J/g.oC. If the same amount of heat is added to identical masses of each of these substances at same initial temperature
A carnot cycle engine is operated between a high temperature of 500K and at a low of 3000K. The work done is 800J. how much heat
A certain substance has a heat of vaporization of 39.17 Kj/mol. At what kelvin temperature will the vapor pressure be 6.50 times higher than it was at 325k?
What prefix is used to name a hydrocarbon with two carbon atoms?
What volume in mL of 0.7M NaOH solution would react with 83mL of 0.74M H3PO4 solution. Balnced equation needed and answer should be reported in two decimal pleaces.
If the volume of an unknown liquid is measured and found to be 6.510 L, what is the volume of the unknown liquid in milliliters?
Celsius and -125 degrees Celsius , respectively. Calculate the entropy changes for fusion ( solid to liquid) and vaporization (liquid to gas ).
Determine how many grams of NaCl should be dissolved in a liter of H 2 O to produce an isotonic solution?
At a given temperature, the equlilibruin constant for the system studied in an experiement is 1.40x10^2. Suppose 100.0 ml of 2.00 x 10^-3 M KSCN was mixed with 100.0 ml of 2.00 x 10^-3 M Fe(NO3)3
You have samples of approximately 8mL solution with ph ranging from 4 to 10. Calculate the volume of 1M HCIO4 needed to lower the ph to 2.5.
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