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.

Expert Solution

queen_honey_blossom answered 2 years ago

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?

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?

In the caffeine extraction from an energy drink lab: a. Why was it necessary to extract...

In the caffeine extraction from an energy drink lab: a. Why was it necessary to extract the caffeine from the energy drink? Why could we not have sublimated the energy drink directly as a solution? b. Why did we extract the energy drink with dichloromethane, specifically, and not another organic solvent such as methanol or hexane?

0.170g of caffeine is dissolved in 10.0mL of water. The caffeine is extracted from the aqueous...

0.170g of caffeine is dissolved in 10.0mL 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 three portions of methylene chloride. Caffeine has a distribution coefficient of 4.6 between methylene chloride and water. Please explain throughoutly. This is my first time working with extraction question

A sample of THAM primary standard base weighed 0.9180 grams. After dissolving in 100ml deionized water...

A sample of THAM primary standard base weighed 0.9180 grams. After dissolving in 100ml deionized water and adding four drops of brom-cresol-green indicator, an HCl solution was added gradually until a definite color change was observed. At this point, 28.20 ml of HCL solution had been drained from the buret. Using the equation for the overall reaction, calculate the molarity of the HCl

1a- Discuss the vaporization of water in standard condition at 298 K in term of: -...

1a- Discuss the vaporization of water in standard condition at 298 K in term of: - exothermicity and endothermicity - change of entropy of the system and the surrounding - spontaneity of the reaction. 1b- Explain how the temperature and the composition of the two phases (liquid and vapour) influence the spontaneity of the vaporization of water.

1a- Discuss the vaporization of water in standard condition at 298 K in term of: -A...

1a- Discuss the vaporization of water in standard condition at 298 K in term of: -A exothermicity and endothermicity -Achange of entropy of the system and the surrounding - A spontaneity of the reaction. 1b- Explain how the temperature and the composition of the two phases (liquid and vapour) influence the spontaneity of the vaporization of water. Please show steps and give ample explanation. Thank you

1: Discuss the vaporization of water in standard condition at 298 K in term of: -1A...

1: Discuss the vaporization of water in standard condition at 298 K in term of: -1A exothermicity and endothermicity -1B change of entropy of the system and the surrounding -1C spontaneity of the reaction. ------ 2- Explain how the temperature and the composition of the two phases (liquid and vapour) influence the spontaneity of the vaporization of water. Please show steps and give ample explanation. Thank you

An extract from a toboacco leaves is completely miscible in water at temperatures below 60 C....

An extract from a toboacco leaves is completely miscible in water at temperatures below 60 C. What is the molality of a solution of this extract in water which freezes at -0.450 C. If this solution was obtained by dissolving 1.921 g of the extract in 48.92g of water, What is the molar mass of the extract? Combustion analysis of the extract yields 74.03% C, 8.70% H, and 17.27 % N by mass. What is the molecular formula of the...

i need a good introduction for a lab report about (isolation of caffeine from No-Doz tablets)...

i need a good introduction for a lab report about (isolation of caffeine from No-Doz tablets) . i am really not good at writing introduction and councluion. for introduction i only wrote ( The purpose of this experiment was to extract the caffeine from a No-Doz tablets by recrystallizing it.) please help!!

Question