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Chem Help percent yield of recrystallization

#1 User is offline   zeli 

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Posted 25 January 2007 - 02:07 PM

i have a quick question cause i'm kind of stuck. i dissolved 1g of phenantrene and recrystallized it. i weighed it to be 1.99g. is that possible.
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#2 User is offline   lilsh0rtnancy 

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Posted 25 January 2007 - 06:49 PM

QUOTE(zeli @ Jan 25 2007, 02:07 PM) View Post
i have a quick question cause i'm kind of stuck. i dissolved 1g of phenantrene and recrystallized it. i weighed it to be 1.99g. is that possible.



I don't think it's possible to get more than what you started with. When you're recrystallizing, you're basically recovering something in a pure crystallized form so it should be less than what you started with. Did you tare the scale before weighing the crystals? I hate chem labs by the way. Good luck.
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#3 User is offline   zeli 

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Posted 25 January 2007 - 08:53 PM

haha thanks for the luck. i didn't think it was possible either (must not have dried it enough...sigh)
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#4 User is offline   FRUITYCHEESECAKE 

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Posted 25 January 2007 - 10:08 PM

It could have picked up elements form the environment but you should dry it some more...
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#5 User is offline   ovette 

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Posted 01 February 2007 - 01:50 AM

yah i agree make sure first that it's dry and it's not hygroscopic (meaning it does not absorb water from it's surroundings)... the final mass must be equal or less than the initial... smile.gif
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#6 User is offline   junesuh86 

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Posted 01 February 2007 - 08:34 AM

just make up your numbers, thats what i do. smile.gif
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#7 User is offline   kAytiieee 

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Posted 01 February 2007 - 12:18 PM

QUOTE(junesuh86 @ Feb 1 2007, 08:34 AM) View Post
just make up your numbers, thats what i do. smile.gif

Eh heh heh lol *sweats* =_____=;;

sweatingbullets.gif sweatingbullets.gif




But yeah...did the drying more help??

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