Question
In: Chemistry
A student is extracting a caffeine/water solution with dichloromethane. The K value is 4.6. If the...
A student is extracting a caffeine/water solution with dichloromethane. The K value is 4.6. If the student starts with 70 mg of caffeine in 2 mL of water and wants to do three extractions (each with 2 mL of dichloromethane) - what is the calculated amount of caffeine in each of the three extracts? How much caffeine total in all three extracts of dichloromethane?
Solutions
queen_honey_blossom answered 1 year agoRelated Solutions
A student is extracting a caffeine/water solution with dichloromethane. The K value is 4.6. The student...
A
student is extracting a caffeine/water solution with
dichloromethane. The K value is 4.6. The student starts with a
total of 70 mg of caffeine in 2 mL of water and decides to use
three extracts. How much caffeine will be in each dichloromethane
extract? What is the percent recovery of caffeine?
You want to decaffeinate your coffee by extracting the caffeine outwith dichloromethane. It's too late to...
You want to decaffeinate your coffee by extracting the caffeine
outwith dichloromethane. It's too late to extract the caffeinefrom
the coffee beans because you've already brewed yourself a 200mL cup
of coffee. Your particular brand of coffee contains100 mg of
caffeine in that 200mL cup. The partitioncoefficient of caffeine in
dichloromethane/water is 9.0. How much caffeine would still be in
your 200 mL if you did: A. One extraction using 200 mL
ofdichloromethane B. Two extractions using 100 mL ofdichloromethan...
You want to decaffeinate your coffee by extracting the caffeine outwith dichloromethane. It's too late to...
You want to decaffeinate your coffee by extracting the caffeine
outwith dichloromethane. It's too late to extract the caffeinefrom
the coffee beans because you've already brewed yourself a 200mL cup
of coffee. Your particular brand of coffee contains100 mg of
caffeine in that 200mL cup. The partitioncoefficient of caffeine in
dichloromethane/water is 9.0. How much caffeine would still be in
your 200 mL if you did: A. One extraction using 200 mL
ofdichloromethane B. Two extractions using 100 mL ofdichloromethan...
Alex and Carisma need to extract caffeine from 100ml of water at standard condition using dichloromethane...
Alex and Carisma need to extract caffeine from 100ml of water at
standard condition
using dichloromethane (DCM) in two extraction steps. 50ml of DCM is
used for the first extraction, while 80ml is used for the second to
ensure the adequate removal of caffeine. The solubility of caffeine
in DCM is 0.5g/ml, and its solubility in water is 0.2g/ml.
Calculate the percentage extraction after the second extractive
process.
1.13 g caffeine was dissolved in 60 mL water. The solution was extracted with 3 portions...
1.13 g caffeine was dissolved in 60 mL water. The solution was
extracted with 3 portions of 20 mL methylene chloride. How much
caffeine is left in the water after the extractions? Show your
work.
The solubility of caffeine in water is 2.26 g/100 mL at 25
degrees C.
The solubility of caffeine in methylene chloride is 8.42 g/100
mL at 25 degrees C.
Caffeine (C8H10N4O2) is a stimulant found in coffee and tea. A solution of caffeine in the...
Caffeine (C8H10N4O2) is a stimulant found in coffee and tea. A
solution of caffeine in the solvent chloroform (CHCl3) has a
concentration of 0.0490m.
a. Calculate the percentage of caffeine by mass in the
solution.
b. Calculate the mole fraction of caffeine in the solution.
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine,...
A student researcher performed a chromatographic separation of
caffeine and aspartame. The retention time for caffeine, t c , was
found to be 201.4 s with a baseline peak width, w c , of 13.8 s.
The retention time for aspartame, t a , was 265.0 s with a baseline
peak width, w a , of 21.4 s. The retention time for the unretained
solvent methanol was 40.9 s.
Calculate the average plate height, H , in micrometers for this...
In this experiment, 0.100 g of caffeine is dissolved in 4.0 mL of water. The caffeine...
In this experiment, 0.100 g of caffeine is dissolved in 4.0 mL
of water. The caffeine is extracted from the aqueous solution three
times with 2.0-mL portions of methylene chloride. Calculate the
total amount of caffeine that can be extracted into the three
portions of methylene chloride. Caffeine has a distribution
coefficient of 4.6, between methylene chloride and water.
In this experiment, 0.170 g of caffeine is dissolved in 10.0 mL of water. The caffeine...
In this experiment, 0.170 g of caffeine is dissolved in 10.0 mL
of water. The caffeine is extracted from the aqueous solution three
times with 5.0-mL portions of methylene chloride. Calculate the
total amount of caffeine that can be extracted into the three
portions of methylene chloride. Caffeine has a distribution
coefficient of 4.6 between methylene chloride and water.
0.070g of caffeine is dissolved in 4.0ml of water. Calculate the total amount of caffeine that...
0.070g of caffeine is dissolved in 4.0ml of water. Calculate the
total amount of caffeine that can be extracted by:
a) a 6.0ml portion of methylene chloride
b) three 2.0ml portions of methylene chloride
Caffeine has a distribution coefficient of 4.6, between
methylene chloride and water.
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