The distribution coefficient, KD (C ether/C water), between ether and water for aspirin at room temperature is 3.5. What weight of aspirin would be extracted by a single extraction with 150 mL of water from a solution of 10 gms of aspirin in 100 mL of ether? Calculate the weight of aspirin which would be removed by three extractions with 50 mL portions of water.

The distribution coefficient, KD (C ether/C water), between ether and water for aspirin at room temperature is 3.5. What weight of aspirin would be extracted by a single extraction with 150 mL of water from a solution of 10 gms of aspirin in 100 mL of ether? Calculate the weight of aspirin which would be removed by three extractions with 50 mL portions of water.

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter7: Extraction

Section: Chapter Questions

Problem 1Q

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1. Why should the stopper always be removed from a separatory funnel whenever a liquid is being drained through the stopcock?2. The distribution coefficient, KD (ether/water), between ether and water for aspirin at room temperature is 3.5. What weight of aspirin would be extracted by a single extraction with 60 ml of water from a solution of 10 grams of aspirin in 100 ml of ether? Calculate the weight of aspirin which would be removed by three extractions with 20 ml portions of water.
The solubility of suberic acid C6H12(COOH)2 is 0.14 g/100 ml H2O and 0.56g/100 ml ethyl ether at 15 0C. Calculate the weight of suberic acid removed from 50 ml aqueous solution containing 40 mg acid by extraction with 50 ml ether. Calculate the weight of acid that would be removed by two successive 25 ml extraction with ether.
A pharmacist needs 250 mL of 80% v/v alcohol to macerate a dried sample weighing 100grams. If the available concentration of alcohol is 95% v/v, compute the volume of water andvolume of 95% alcohol required to prepare the desired concentration?
Compound X has a distribution coefficient (K) of 5 for ether/water. If 5.0 g of compound X were dissolved in 500.0 mL of water, how many grams of compound X would be recovered from the water layer after two consecutive extractions using 50.0 mL portions of fresh ether from each extraction
The distribution coefficient, KD (C water/C ether), between ether and water for aspirin at room temperature is 0.30. What weight of aspirin would be extracted by a single extraction with 300 mL of water from a solution of with a concentration of 0.67 M? Calculate the weight of aspirin which would be removed by three extractions with 100 mL portions of water. Compare the weight of solute extracted in single extraction process with the triple extraction process. Take note: The volume of the solution is 100ml
When a solution of 1.00 g of ‘X’ in 100 ml of water was shaken with 10 ml of diethyl ether, 0.60 g of X was transferred to the solvent (ether) layer. When another solution of 0.5 g of ‘X’ in 100 ml of water was shaken with 5 ml of petroleum ether, 0.3 g of X was extracted by the solvent. Which of these ethers is a better solvent? Justify your answer using calculations.
10g coffee 4g sodium carbonate 40m dichloromethane 160ml distilled water coffee filter What are the principles behind caffeine being extracted from coffee using the above items? 1st sodium carbonate mixed with coffee then brought to a boil for 20min then solution/grinds are filtered. Then solution is added to a separatory funnel with 15ml of dichloromethane and two layers are observed so the bottom layer with DCM contains the caffeine, then this layer is collected in a beaker and dried out using molecular seeds. Then the solvent is brought to a boil with crude caffeine remaining and recystallized using 95% ethanol and brought to a boil again. Then the contents are vaccum filtered and allowed to dry resulting in 30mg caffeine.
A 25 g of butyric acid was extracted with 400 mL ether from 400 mL water (Kd=3.0 at 25 °C) Using single-step extraction, what is the amount of butyric acid in water layer? What is the total amount of butyric acid extracted using two successive extractions? Calculate the % efficiency of two-step extraction over single
There are two separate phases, one with a composition of 12% phenol and the other with a composition of 60% phenol, from a 210 gram phenol-water mixture at 60 °C with a composition of 35% phenol. Calculate the masses of these phases.
An organic compound has a distribution coefficient of 1.5 in methylene chloride and water. If 50 mg of this compound is dissolved in 15 mL of water, in which case will more of the compound be extracted into the methylene chloride: one extraction with 15 mL of methylene chloride or three extractions using 5 mL of methlene chloride each time? Show all work.
1. What is the MW of the analyte?2. What is the meq of the analyte?3. What will be the weight (in grams) of the analyte if the standardization is to be quartered?4. What will be Normality of the solution if 7.5ml of the titrant was consumed in the standardization?5. What is the average Normality if two or more trials were conducted with the values of 0.102N and 0.105N?
Six 50.0 ml volumetric flask 1 through 6 are labeled. 10.00 ml of 2.00 x 10-1 M Fe(NO3)3 solution was then pipet into each volumetric flask. A 1.00,2.00,3.00,4.00 and 5.00ml of 2.00 x 10-3M NaSCN solution was then pipetted to flask 2 through 6 respectively. A sufficient amount of 0.10 M nitric acid was then added to each flask to make each a total volume of 50.00ml. Hint M1V1=M2V2 a)what would be the concentration of Fe(NO3)3 in 0.10M HNO3? b)what would be the concentration of NaSCN in 0.10M HNO3?