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Topic: extraction with adipic acid  (Read 14342 times)

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Offline doc1965

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extraction with adipic acid
« on: February 13, 2007, 05:56:00 PM »
Hi everyone...

I need some help/guidance regarding my organic lab.  I have looked on the web and in my first year chem book and have not found what I am looking for.  I am doing an extraction with adipic acid transferring it into a flask with NaOH and phenolphthalein as an indicator.  We also mix it with ether in a second step of the experiment. Both parts ask this question:

Normality of Adipic Acid solution (normality is what I dont understand what they are looking for)

I am not sure what this is asking me
 
I know the rules of the forum but I need some help or to be pointed in the right direction

Thanks
Doc
« Last Edit: February 13, 2007, 06:49:22 PM by Mitch »
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Offline english

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Re: extraction
« Reply #1 on: February 13, 2007, 06:04:38 PM »
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Offline doc1965

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Re: extraction
« Reply #2 on: February 13, 2007, 06:40:37 PM »
I read that and if I understand it correctly, it means the normality of adipic acid is 10 because there are 10 H+ ions in the solution based on the chemical equation of Adipic acid = C4H10O4  Is this correct?

Man I am so confused and our TA's are no help  argh   ???
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Offline Mitch

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Re: extraction
« Reply #3 on: February 13, 2007, 06:49:05 PM »
No, normality only refers to the acidic protons. If you have 1M HCl, the normality is 1Normal. If you have 1M H2SO4, then you have a 2N solution.
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Offline doc1965

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Re: extraction with adipic acid
« Reply #4 on: February 13, 2007, 07:02:08 PM »
Mitch...

I get what you are saying but I am using adipic acid no HCl or others. So how does this fit into the normal aspect of this?  This is where I get totally confused

Doc
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Offline Borek

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Re: extraction with adipic acid
« Reply #5 on: February 13, 2007, 07:38:48 PM »
You have to look at the adipic acid structure - how many protons can it give during dissociation?
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Offline doc1965

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Re: extraction with adipic acid
« Reply #6 on: February 13, 2007, 07:46:04 PM »
If I understand what you are asking, it has 2 because it has to carboxylic acid groups

doc
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Offline Borek

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Re: extraction with adipic acid
« Reply #7 on: February 13, 2007, 08:24:16 PM »
OK, now read about normality and think - what is normality of adipic acid? Isn't it in a way similar to H2SO4 Mitch listed?
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Offline doc1965

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Re: extraction with adipic acid
« Reply #8 on: February 14, 2007, 06:16:10 PM »
I sorta get it now....but her is a stupid question. Is molarity the same as concentration.  The question is asking for the concentration and millimoles of Adipic Acid?  Man my brain hurts

Thanks
Doc
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Offline Borek

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Re: extraction with adipic acid
« Reply #9 on: February 14, 2007, 06:35:55 PM »
Molarity is just molar concentration, mol/L.
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Offline doc1965

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Re: extraction with adipic acid
« Reply #10 on: February 14, 2007, 07:22:02 PM »
Ok....I have calculated the molarity of adipic acid so now I am trying to figure out how this fits into the concentration and normality:

? mol C6H10O6 = 10mL C6H10O6 x (1.36/ 1 mL) x (1 mol C6H10O6/146.14 g C6H10O6)

1.36 being the density of C6H10O6 and 146.14 being the molecular weight? 

What I dont get is how moles has anything to do with concentration and nomality?  Any suggestions

Doc
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Offline Borek

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Re: extraction with adipic acid
« Reply #11 on: February 14, 2007, 07:26:08 PM »
Quote from: doc1965 on February 14, 2007, 07:22:02 PM
What I dont get is how moles has anything to do with concentration and nomality?  Any suggestions

Read definition?
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Offline doc1965

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Re: extraction with adipic acid
« Reply #12 on: February 14, 2007, 07:27:38 PM »
I have and I just dont get it....I am stupid (not to mention getting frustrated)

Doc
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Offline doc1965

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Re: extraction with adipic acid
« Reply #13 on: February 14, 2007, 07:29:44 PM »
Normality is defined as: It is expressed as number of equivalents per liter.  so in the case of adipic acid, there are to H+ available given that there are two carboxylic acid groups
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Offline doc1965

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Re: extraction with adipic acid
« Reply #14 on: February 14, 2007, 07:30:58 PM »
the number of moles per liter of solution is .09 mol of adipic acid
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