Chemical Forums

Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: mehcp on October 04, 2013, 01:02:22 AM

Title: HCl Saturation in Methanol
Post by: mehcp on October 04, 2013, 01:02:22 AM

I want to prepare Hydrogen Chloride saturated Methanol by bubbling dry HCl gas into 1 L Methanol 0-4°C.  I'm adding concentrated HCl to Calcium Chloride drop-wise via an addition funnel (as noted here http://curlyarrow.blogspot.com/2009/03/how-to-make-dry-hcl-gas.html (http://curlyarrow.blogspot.com/2009/03/how-to-make-dry-hcl-gas.html) and here http://chemtips.wordpress.com/2012/12/18/snap-crackle-pop-anhydrous-hcl-generation/ (http://chemtips.wordpress.com/2012/12/18/snap-crackle-pop-anhydrous-hcl-generation/)).

I'd like to know the following:

• How much CaCl₂ and HCl should be required to saturate 1 L methanol with HCl gas?
• How long should it take to reach saturation?
• What is the saturation concentration of HCl gas in Methanol?
• I imagine the concentration can be verified via titration, but what is the best method for doing so?
• I am using a glass Pasture pipette to bubble in the HCl gas, but it seems a diffuser of some sort would work better to get more of the gas into solution.  Are there any recommendations or suggestions for this purpose?  Or should I just draw out the pipette to a finer tip to get smaller bubbles?