Extraction Lab Report

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Introduction
Extraction is a technique used for separating a compound from a mixture. One of the example of extraction is liquid-liquid extraction. This process involves the distribution of compound between two solvents that are immiscible in each other. As a result of the different solubilities of the solutes in two different solvent, the compounds can be selectively transported from one phase to another.
This occurrence is quantified by the partition coefficient (K):

K = (concentration of solute in ether phase)/(concentration of solute in water phase )
During extraction, an aqueous phase and the organic phase are shaken in a flask and are the mixture are then allowed to distribute themselves between the …show more content…

Calculate the percentage recovery of each solutes.

Pre lab questions Excluding spillage and incomplete transfer of solids from the filter papers, what would be responsible for a low recovery of a component in a separation by extraction?
Answer : Other possible reason of the low recovery components in a separation by extractions is that the mixture is not shaken well or the mixture is not shaken long enough. As a result the components are not much dissolve in the each solvent. The distribution coefficient K for compound X in diethyl ether/water is 3. If 12.0g of compound X is in 400Ml water, calculate the weight of X removed into ether by : Extracting the aqueous solution once with 200Ml ether Extracting the aqueous solution twice with 100Ml ether each time
Answer : K = (concentration of compound X in diethyl ether )/(concentration of compound X in water )

3 = ((X)g/2OOmL)/((12-X)g/400mL) x = 7.2g K = (concentration of compound X in diethyl ether )/(concentration of compound X in water )

First extraction
3 = ((X1)g/ (100mL ))/((12-X1)g/400mL) X1 = …show more content…

From the first extraction, the amount of compound X left in the aqueous layer is 6.86g Second extraction 3 = ((X2)g/100 ml)/((6.86-X2)/400mL) X2 = 2.94g
Therefore the total amount of compound X extracted is X1+X2= 8.08g

Flowchart Mixture (carboxylic acid + neutral compound)

Dichloromethane

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