In this procedure your organic acid was isolated by precipitation and subsequent
ID: 902940 • Letter: I
Question
In this procedure your organic acid was isolated by precipitation and subsequent filtration. If the resulting organic acid had been soluble in the aqueous solution, how could it have been isolated? You are given a two-phase system containing an aqueous layer and an organic layer, but you don't know which is which, nor do you know the identity of the organic solvent. How could you determine which layer is the water layer? In this experiment, could you have used methanol in place of dichloromethane? What is the identity of the two components present in your unknown?Explanation / Answer
D. Post lab questions
1. If the resulting organic acid has been soluble in aqueous solution, we isolate the organic acid by extraction with an organic solvent such as diethylether from the aqueous solution. Several extraction steps are performed to isolate the compound.
2. Adding water to the two layers and observing the change in volume has occured to which layer would tell us which layer is aqueous and which is organic layer. Th aqueous layer would have an increase in volume by adding additional water to the system whereas the organic layer would remain the same.
3. Dichloromethane is a water immsicible solvent whereas methanol is a water miscible solvent. Therefore, we could be use methanol in place of dichloromethane in this experiment.
4. We need experimental procedure to identify the two components for the unknown.
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