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 (Carbon dioxide) as a chilling source.
Types of Mixtures
The below list is of basic, common, and easy to use mixtures[1].
- Ice (0 °C) - Grind for best use.
- 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, may 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 the liquid nitrogen will evaporate, the ethanol will have the consistency of a syrup.
References
A more complete list of cooling baths can be obtained at the chem-wiki reference.
