Table of Contents
- 1 What is the determining factor for a solvent to be the top or bottom layer?
- 2 How do you determine which layer is on top during extraction?
- 3 How do you determine which layer is the aqueous layer in an extraction?
- 4 What makes a good extraction solvent?
- 5 Which layer is on top organic or aqueous?
- 6 Why do we know the aqueous layer is the upper layer during the wash steps?
- 7 Which layer is aqueous and which layer is organic?
- 8 What determines the position of the aqueous and organic layers in an extraction?
What is the determining factor for a solvent to be the top or bottom layer?
The location (either the top or bottom layer) of an extraction solvent is determined by density. The density of ether is 0.713 g/cm3 and the density of H2O is 1.0 g/cm3; therefore, ether is always the top phase when the extraction solvent pair is ether and water.
How do you determine which layer is on top during extraction?
Whether the organic layer is the top or bottom layer will depend on the density of the organic solvent. If the density of the organic solvent is greater than that of water (1.00) then the organic layer will be the bottom layer. If the density is greater than that of water, then the organic layer will be the top layer.
How can you tell which layer top or bottom is the organic layer?
During extraction, the organic layer is usually on the top and the aqueous layer is on the bottom in the separatory funnel. Give a specific example of an organic solvent that, when used during an extraction, would be the bottom layer, forcing the aqueous to the top.
How do you determine which layer is the aqueous layer in an extraction?
To determine which layer is which, one can simply add distilled water to the funnel. Whichever layer increases in size must be the aqueous layer and the other is the organic layer. At this point the two layers can be separated into their respective beakers.
What makes a good extraction solvent?
—- Here is the general rule: The more polar the organic solvent, the more it is miscible (soluble) with water. Organic solvents with low polarity such as hexanes, toluene, dichloromethane and diethyl ether are usually chosen as the organic extracting solvent.
What rule of thumb would you use to determine which solvent floats and which one sinks?
However, there are some rough rules of thumb here, too. Most organic solvents are less dense than water, so they float on the top. A few organic solvents are more dense than water, so they sink to the bottom.
Which layer is on top organic or aqueous?
In the left separating funnel, the aqueous layer is on the bottom, meaning the organic layer must be less dense than water. In the right separating funnel, the aqueous layer is on the top, meaning the organic layer must be more dense than water.
Why do we know the aqueous layer is the upper layer during the wash steps?
It is essential that you know whether the aqueous layer is above or below the organic layer in the separatory funnel, as it dictates which layer is kept and which is eventually discarded. Two immiscible solvents will stack atop one another based on differences in density.
How do you know if a molecule is organic or aqueous on top?
Which layer is aqueous and which layer is organic?
It is essential that you know whether the aqueous layer is above or below the organic layer in the separatory funnel, as it dictates which layer is kept and which is eventually discarded….Density.
| Solvent | Density (g/mL) |
|---|---|
| Dicholoromethane (CH2Cl2) | 1.33 |
| Chloroform (CHCl3) | 1.49 |
What determines the position of the aqueous and organic layers in an extraction?
What is the criteria for selection of solvent used in an extraction?
The extracting solvent must be immiscible with the solution to be extracted. WATER or a water-based solution is usually one of the pair. The other solvent is an ORGANIC SOLVENT .