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Chemistry infolab reagents and resources
Oil baths and freezing mixtures.

Silicone oil, dry ice mixture

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OIL TEMPERATURE BATHS


Media m.p.
°C
b.p.
°C
Working range °C Flash point °C REMARKS



Water
0 100 0 to 80 none Ideal within the stated range
Ethylene glycol -12 198 -10 to 180 111 Flammable, difficult to remove from equipment
Silicone oil -60 >250 20 to 250 300 becomes viscid at lower temp; non-corrosive
Triethylene glycol -7 287 0 to 250 156 water-soluble, stable
Glycerol 18 290 20 - 260 160 water-soluble, non-toxic, viscid
Paraffin liquid   300-500 20 to 200 230 Flammable
Heating bath fluid -40   0 to 170 280 miscible with water, non-toxic
Potassium nitrate
(51.3%)
219   230 to 500   stable in air,strong oxidizing agent, non flammable
Sodium hydroxide
(40%)
167   200 to 800   corrosive and harmful


FREEZING MIXTURES


Media Temperature that can be reached
°C
REMARKS
Ice water and salt (sodium chloride) can reach up to -20 °C with this mixture This is the standard laboratory freezing mixture
Ice water and hydrous calcium chloride temperatures can be obtained as low as -55 °C with this mixture This temperature could not be achieved in this lab
Dry ice and acetone One can go as low as -78 °C with this combination It takes patience, effort and dedication to achieve such low temperatures
Dry ice and Diethyl ether may be possible to reach down to -100 °C with this mixture This temperature could not be obtained. It seems most likely that the temperatures are highly dependent upon the relative proportion of the reactants in the combination mixtures.




Signature: Dhanlal De Lloyd, Chem. Dept, The University of The West Indies, St. Augustine campus
The Republic of Trinidad and Tobago.
Copyright:delloyd2000© All rights reserved.