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Topic: Benzoic Acid from Sodium Benzoate  (Read 8965 times)

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Offline Random

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Benzoic Acid from Sodium Benzoate
« on: June 28, 2010, 05:22:07 PM »
I want to make benzoic acid from sodium benzoate. How to isolate it? Should I use HCl + Sodium Benzoate? If I need to use acids, I currently have acetic and citric acid.
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Offline Jorriss

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Re: Benzoic Acid from Sodium Benzoate
« Reply #1 on: June 28, 2010, 08:31:44 PM »
I don't see why HCl and Sodium Benzoate wouldn't work.

It seems all you would really need is a stronger acid than benzoic acid.
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Offline Random

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Re: Benzoic Acid from Sodium Benzoate
« Reply #2 on: June 29, 2010, 04:54:21 AM »
Is citric acid or acetic acid stronger than benzoic acid?
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Offline AWK

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Re: Benzoic Acid from Sodium Benzoate
« Reply #3 on: June 29, 2010, 05:02:39 AM »
Benzoic acid is poorly soluble in cold water (a few grams per liter)
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Offline Random

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Re: Benzoic Acid from Sodium Benzoate
« Reply #4 on: June 29, 2010, 05:42:30 AM »
Quote from: AWK on June 29, 2010, 05:02:39 AM
Benzoic acid is poorly soluble in cold water (a few grams per liter)

But can I react citric acid with sodium benzoate to make benzoic acid?
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Offline Schrödinger

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Re: Benzoic Acid from Sodium Benzoate
« Reply #5 on: June 29, 2010, 07:45:55 AM »
Quote from: Random on June 29, 2010, 05:42:30 AM
But can I react citric acid with sodium benzoate to make benzoic acid?
Try wikipedia. pKa values for each of these compounds is given
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Offline AWK

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Re: Benzoic Acid from Sodium Benzoate
« Reply #6 on: June 29, 2010, 08:12:55 AM »
Quote from: Random on June 29, 2010, 05:42:30 AM
Quote from: AWK on June 29, 2010, 05:02:39 AM
Benzoic acid is poorly soluble in cold water (a few grams per liter)

But can I react citric acid with sodium benzoate to make benzoic acid?
Citric acid is a bit "stronger" than benzoic one but but using HCl is needed
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