1.) 0.072 grams of caffeine dissolved in 1.5ml of methylene chloride. 0.028 grams of caffeine dissolved...
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 (see Technique 12, Section 12.2). 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 is...
0.070 g of caffeine is dissolved in 4.0 mL of water. The caffeine is extracted from the aqueous solution three times in 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, 0.070 g of caffeine is dissolved in 4.0 ml of water. The caffeine is extracted for the aqueous solution 3 times with 2.0 ml portions of methylene chloride. The methylene chloride extracts are combined and the solvent evaporated resulting in isolated caffeine crystals. Briefly explain why caffeine will prefer the methylene chloride solvent to the water solvent. You need to draw the structures for all three compounds.
Part A 1. If you had used more methylene chloride in each step, you could have extracted more caffeine. Explain why you did not. Hint - What step would have taken longer (Hint: not drying). PART A Mass of Beaker & Caffeine Mass of Beaker 167.750g 67.6809 Mass of Caffeine 0.0 75 Calculations. Show your work and circle the answers. Mass of caffeine recovered: 012919 b) Actual:.07 % caffeine recovered: a) Predicted: 9 7:213% b) Actual: 92.105% PART B Unknown...
If you have 3.03 g of caffeine dissolved in 59.4 mL of water and the extraction coefficient between H2O and CH2Cl2 is 21.51. How many grams of caffeine will extract into the CH2Cl2 layer if you use 78.0 mL?
The distribution coefficient between methylene chloride and water for solute Y is 9. An amount of 125.0.0 g of Y is dissolved in 160 mL of water. a) What weight of Y would be removed from water with a single extraction with 160-mL of methylene chloride? Report to 1 decimal place. b) What weight of Y would be removed from water (the original solution with the original amount) with two successive extractions with 80-mL portions each of methylene chloride? Report...
1.) What percent recovery could be expected if 1.000 g of
caffeine was initially dissolved in 120 mL of water and then
extracted with a single 80 mL portion of ethyl acetate?
2.) What percent recovery could be expected if 1.000 g of
caffeine was initially dissolved in 120 mL of water and then
extracted as per the protocol given in the lab manual?
3.) Percent recovery and percent yield are occasionally used as
if they are interchangeable terms. They...
Find the compound methylene chloride on the internet. a) Why do you think the name starts with the prefix “meth”? How does it relate to the structure of the compound? b) List any other names you found for methylene chloride c) What are the similarities between the names? d) Methylene chloride does not dissolve well in water, but dissolves oily materials like tars and asphalt fairly well. Given what you know about intermolecular forces why might this be the case?...
Determine the Molarity of the solution produced when 3.54 grams of Tin (1) Chloride is dissolved in enough water to make 1.0 L of solution
how many grams of sodium chloride would need to be dissolved to make 750 mL of a 1.7 M solution?