Difference between revisions of "Cooling bath"

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Cooling baths are solutions or mixtures that allow for cooling during a reaction or experiment. Many different solutions and mixtures are available to the amateur, often using ice or dry ice (solid carbon dioxide) as a chilling source.

Common mixtures

The below list is of basic, common, and easy to use mixtures^[1].

• Ice (0 °C) - Grind ice for best use. Snow (if available) can also be used.
• Ice/NaCl at 1:1 (-20 °C) - Works best if ground. Saltwater and dry ice works well too. This is one of the cheapest and easy to make.
• Acetonitrile/Dry ice (-40 °C) - Add dry ice slowly.
• Acetone/Dry Ice (-78 °C) - Mix slowly, as it will produce lots of CO₂.

Other types:

• Liquid nitrogen/Ethanol (-116°C) - Extremely cold, when it forms the surface will rapidly freeze, but the crust is easy to break. Once all the liquid nitrogen will evaporate, the cooled ethanol will have the consistency of a syrup.

List of cooling baths

^{[2] [3]}

References

A more complete list of cooling baths can be obtained at the chem-wiki reference.

1. ↑ http://chemwiki.ucdavis.edu/Reference/Lab_Techniques/Cooling_baths
2. ↑ https://en.wikipedia.org/wiki/List_of_cooling_baths
3. ↑ http://www.larkinweb.co.uk/science/freezing_bath_temperatures.html

Relevant Sciencemadness threads

• Methods of cooling?
• Cooling bath at -10*C