Why Can Dimethyl Ether Extract Benzoic Acid But Dioxane Cannot?

In summary: Dimethyl ether is soluble in water, but less so in dioxane. Dimethyl ether also has a higher boiling point than dioxane.
  • #1
schoolboy10
15
0

Homework Statement


Why is it possible to use dimethyl ether as a solvent for extraction of benzoic acid and not dioxane?


Homework Equations





The Attempt at a Solution



I'm thinking that it's because dioxane has more of a hydrophobic character since it has many carbons, but then wouldn't this make it a good solvent since benzoic acid has many carbons also? This question doesn't seem hard, I'm just a little stumpped and looking for a little tip. Thanks :)
 
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  • #2
You are extracting an aqueous solution of benzoic acid... sodium benzoate, right? An aqueous solution, right?
It's in water, yes?
 
  • #3
Correct.
 
  • #4
WATER.

(This was a hint).
 
  • #5
Sorry, I doubled check and this is not the case. I didn't give enough information in the problem statement, I'm sorry. A solution containing biphenyl and benzoic acid is mixed with water and ether. We originally need to extract both of these compounds into the ether phase which is what the question is asking. (We extract the benzoic acid into the aqueous phase later on). I'm really sorry again guys, I screwed up this question lol. Thanks for your help and patience.
 
  • #6
Guess is that both are soluble in ether. How many extractions to take all of the two organic compounds from the water into the ether, not sure. Since the two listed are both organic, one might guess that extraction into ether goes well.
 
  • #7
schoolboy10 said:
We originally need to extract both of these compounds into the ether phase which is what the question is asking.

What ether phase?
 
  • #8
schoolboy10 said:
Sorry, I doubled check and this is not the case. I didn't give enough information in the problem statement, I'm sorry. A solution containing biphenyl and benzoic acid is mixed with water and ether. We originally need to extract both of these compounds into the ether phase which is what the question is asking. (We extract the benzoic acid into the aqueous phase later on). I'm really sorry again guys, I screwed up this question lol. Thanks for your help and patience.

Borek said:
What ether phase?

What is the solvent of the original sample? Would the assumption that it is in water, be incorrect?

You gave "dimethyl ether" as the solvent to use for extraction. Is the benzoic acid in its acid form or is it in the neutralized form?

May be schoolboy10 or another member can give some facts to explain what is possible.
 
  • #9
Yeah I'm sorry again guys, I screwed up the question in the beginning by not giving enough info lol. Benzoic acid is originally mixed in ethanol. We then place this in a separatory funnel with water and ether. This is where the question applies. Why can't we use dioxane as the ether to extract benzoic acid, but we can use dimethyl ether.

This is confusing to me because I would think that dioxane is more similar to benzoic acid than dimethyl ether is.
 
  • #10
OK then. You start with an aqueous solution that has a little ethanol in it. It's in water essentially. You are extracting an aqueous solution since the benzoic acid is in water. What is it about dimethyl ether that would allow you to extract something from water? How about dioxane?

Hint: Borek was right... WATER is a hint.
 
  • #11
I'm guessing benzoic acid is more soluble in dimethyl ether than water, but in water more than dioxane?
 
  • #12
Write down the properties of dimethyl ether and the properties of dioxane. Compare and contrast. Remember that WATER is a hint.
 

1. What is benzoic acid and why is it important to extract it?

Benzoic acid is a white, crystalline compound that is commonly used as a food preservative and in the production of various products such as pharmaceuticals, cosmetics, and plastics. It is important to extract benzoic acid to obtain it in its pure form for use in these applications.

2. What method is typically used for the extraction of benzoic acid?

The most commonly used method for the extraction of benzoic acid is acid-base extraction. This involves dissolving the benzoic acid in a solvent, adding a base to form the water-soluble salt of benzoic acid, and then separating the acid from the solution.

3. Can benzoic acid be extracted from natural sources?

Yes, benzoic acid can be extracted from natural sources such as fruits, vegetables, and certain types of plants. It is found in these sources in its conjugate form as benzoate, and can be converted to benzoic acid through acidification.

4. What are some safety considerations when performing an extraction of benzoic acid?

When performing an extraction of benzoic acid, it is important to wear appropriate personal protective equipment, such as gloves and goggles, as the compound can irritate the skin and eyes. It is also important to work in a well-ventilated area to avoid inhaling any potentially harmful fumes.

5. What are the potential uses of extracted benzoic acid?

Extracted benzoic acid has a variety of uses in different industries. It is commonly used as a food preservative due to its antimicrobial properties. It is also used in the production of dyes, perfumes, and medications. In addition, it can be used in the synthesis of other compounds, such as benzene derivatives.

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