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Author Topic: fructose density?  (Read 8654 times)

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viper1314

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fructose density?
« on: November 12, 2006, 03:48:47 PM »

I am trying to find the density for fructose..
I am doing a lab that is identifying an unknown substance.    I believe I found it once, but can not find the website any longer, and most places that I have been reading the msds sheets for fructose don't list a density.         I believe it is 1.346, but can't find any place to confirm this.         
If anyone can point me in the right direction, or if you have a chem book with it in there, it would be greatly appreciated if you help me out.

Thanks
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Ψ×Ψ

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Re: fructose density?
« Reply #1 on: November 12, 2006, 05:16:51 PM »

The easiest way to find something's density is usually to check a catalog if it's commercially available.  try www.sigmaaldrich.com and search from there.  Keep in mind that if it's a solid, you won't see a density listed.
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billnotgatez

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Re: fructose density?
« Reply #2 on: November 12, 2006, 05:33:01 PM »

According to Wikipedia Fructose is an isomer of Glucose (C6H12O6).
http://en.wikipedia.org/wiki/Fructose
http://en.wikipedia.org/wiki/Glucose

Glucose Density 1.54 g/cm3
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viper1314

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Re: fructose density?
« Reply #3 on: November 12, 2006, 07:02:19 PM »

That first site, I tried looking at earlier and coulnd't understand where to find the information for density.       The substance is a white crystaline powder that we have in class.

As far as being near gluclose that is possible, but It wouldn't help on my substance since its not close to the density.
We were giving
barium sulfate,  calcium hydroxide, citric acid,  fructose,  monosodoium glutamate, pottassium nitrate, succrose for the options.

My density that I caculated last class was   1.345      9.981grams for a  1/2 tablespoon or 7.3934 cm3= 1.345                none of those are close to that density besides the one I had for fructose at  1.346... sure wish I could find that site again  to confirm.
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billnotgatez

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Re: fructose density?
« Reply #4 on: November 12, 2006, 07:55:33 PM »

My guess is that you would get a variation in weight depending on how well the ½ teaspoon was packed. If you fluff it up the solid would be lighter.

http://en.wikipedia.org/wiki/Isomer

You might want to read up on isomer. I am not saying that isomers always have the same density, but there is a good chance that it will be very close.
« Last Edit: November 12, 2006, 08:07:08 PM by billnotgatez »
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billnotgatez

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Re: fructose density?
« Reply #5 on: November 13, 2006, 01:54:49 AM »

A quick look up of densities not all confirmed
notice that glucose is most likely the least dense and
 if fructose were similar then it would also be the least dense
  compare this with your measurements

Are you required to identify the compound solely on density?


barium sulfate 4.5 g/cm3 BaSO4
calcium hydroxide 2.24 g/cm3 Ca(OH)2
citric acid 1.665 g/cm3 C6H8O7
fructose
Glucose 1.54 g/cm3 C6H12O6
monosodium glutamate    C5H8NO4Na
potassium nitrate 2.1 g/cm3 KNO3
sucrose 1.587 g/cm3 C12H22O11
« Last Edit: November 13, 2006, 02:14:53 AM by billnotgatez »
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viper1314

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Re: fructose density?
« Reply #6 on: November 13, 2006, 04:22:19 AM »

we can do any means necessary to get it done.       So far we have did solubility, heat, and density.
Next step I know to do is PH test,  but after that I don't know any other means to identify.
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viper1314

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Re: fructose density?
« Reply #7 on: November 13, 2006, 04:27:01 AM »

I found the site again, but when I look at it further that was not for a pure fructose. 
http://www.starch.dk/isi/glucose/fructose.htm

The 90% fructose formula has a 1.407 density           

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