Chemical Forums
Chemistry Forums for Students => Organic Chemistry Forum => Organic Chemistry Forum for Graduate Students and Professionals => Topic started by: wildburg88 on February 10, 2014, 10:45:01 PM
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I was wondering if someone could fully explain how to "azeotrope off" ammonium bicarbonate.
If I have a peptide solution in (NH4)HCO3 that I then dry down in a SpeedVac / lyophilize, the ammonium, because it is volatile will blow off leaving the bicarbonate in the sample. If I then had 50/50 H2O/MeOH to the completely tried down sample and lyophilize again and repeat this step 1-2 more times, my sample should be almost completely free of any salt.
How exactly does using 50/50 H2O/MeOH get rid of the bicarbonate? The sample is not being heated in the SpeedVac, which is kept at 4°C. Is it something like azeotropic distillation?
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the ammonium, because it is volatile will blow off leaving the bicarbonate in the sample
Try to write reaction equation.