MadSci Network: Chemistry

Subject: Boiling point of glycol/water mixtures

Date: Wed Jul 21 09:50:56 1999
Posted by Chuck Lemme
Grade level: grad (science) School: Ventana Medical Systems
City: Tucson State/Province: AZ Country: USA
Area of science: Chemistry
ID: 932568656.Ch

Does glycol elevate or depress the boiling point of water? The 
makers of automotive antifreeze make clear claims as to the
freezing point depression, but don't specifically say the BP is 
elevated. A simple test that I did, seemed to indicate that the 
BP is actually depressed at low concentrations. The CRC Handbook 
has vapor pressures or all sorts of compounds as does Merk 
Index. It also gives equations and constants for BP elevation 
for salts dissolved in various solvents, but nowhere can I find 
the vapor pressure of gylcol/water mixtures (BP is temp where 
vapor pressure = one atm). 

Re: Boiling point of glycol/water mixtures

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