need help answering questions 1-5 1. in your own words, define the term \'extrac

Question

need help answering questions 1-5
1. in your own words, define the term 'extraction' as it applies in this experiment.
2. what is the purpose of using anhydrous sodium sulfate (NaSO4) in this experiment?
3. is caffeine more soluble in methylene chloride (CH2CL2) or water (H2O)? explain why solubility is important in this lab.
4. does methylene chloride (CH2CL2) or water (H2O) have a higher boiling point? explain (Note: think about intermolecular forces (IMF)).
5. in steps 2 and 3 of this experiment ,the aqueous 'tea' solution should be cooled to room temperature before the methylene chloride (CH2CL2) is added. why? (Note: think about solubility).

10/13/2017 CHM210: Isolation of Caffeine From Tea Leaves Prelab Assignment Due at the start of lalb 3 points Name 1. In your own words, define the term 'extraction' as it applies in this experiment. 2. What is the purpose of using anhydrous sodium sulfate (Na2SOs) in this experiment? 3. Is caffeine more soluble in methylene chloride (CH Clb) or water (H20)? Explain why solubility is important in this lab. 4. Does methylene chloride (CH2Clb) or water (H20) have a higher boiling point? Explain (Note: think about intermolecular forces (IMF). 5. In Steps 2 and 3 of this experiment, the aqueous 'tea' solution should be cooled to room temperature before the methylene chloride (CH2Cl2) is added. Why? (Note: think about solubility)

Explanation / Answer

Answer:

1. extraction is a way to separate the desired substance when mixed with another. for example when inorganic salts and our required present in the aqueous solution then extract with MDC then product is will come in to organic layer and inorganic salts were present in the water.

2. generally sodium sulfate is used in the experment as a drying reagent that means if water traces present in the organic layer then dried with sodium sulphate then sodium sulphate absorbed water traces and it is converted into sodium hydroxide.

3.caffiene is more soluble in methylene chloride than water.

in MDC, caffiene is soluble 14 g per 1 litre.

but in water it is soluble 2.2 g per litre.

4. water is higher boiler than methylene chloride due to in the water,ionicforces and hydrogen bonding is present.

5. whenever before adding the methylene chloride in to reaction mass, it should be cooled to room temperature because methylene chloride boiling point is 40 deg c. if methylene chloride is evoporated then extraction of product is very critical. so suggestion is extraction when used low boiler solvent room temperature is preferable.

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