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| Laboratory Tips Safety proceedures, test reagents, drilling rubber stoppers, bending glass tubes, etc. Contributed to by chemists. |
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#1
 2004-01-14, 16:18
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smack 
Regular
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recrystalization question
swim wants to know if after the 24hrs. in the freezer should he wash crystals with cold iso. and should the tone be dry that is added
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#2
 2004-01-14, 17:48
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kman 
Regular
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Re: recrystalization question
ALWAYS dry your solvents! The water in 'tone(about 25%) will suck goodies out.
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#3
 2004-01-14, 19:42
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smack 
Regular
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Re: recrystalization question
Swim just told me that he has bigger problem after dissolving the good in the iso he was bringing it to a soft boil things were going good but then the iso fumes ignited swim said that after about 15 sec of the iso burning he added about twice the volume of water to the iso. Swim used 350ml of iso to dissolve 5g of goods. is there a way to get anything out of this or is swim screwed. help
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#4
 2004-01-14, 20:43
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kman 
Regular
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Re: recrystalization question
What were you boiling the iso with? If you were using an open flame, or even a household electric range, then you aren't being safe. Swim recommends a hotplate.
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#5
 2004-01-14, 21:00
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smack 
Regular
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Re: recrystalization question
swim was using a portable electric range the one with two burners on it. swim know that he should have used a hotplate and probable will wish that he had in the end. swim went out and bought a new hotplate right after that so he will not have that problem any more. Swim has the iso/water mix sitting there and would like to see if he can get anything back. Swim know that he f-up and will not let that happen again.
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