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THE RECIPE FOR PRODUCING COOLING SOLUTIONS
To cool certain solutions in the laboratory, it is necessary to prepare " cooling mixtures ". There are many different recipes for making such mixtures. The most common are also readily available are the following cooling mixtures.
Mix 3 authority. elements of snow or crushed ice with 1 part of table salt ( NaCl ). This cooling mishmash can give a temperature of -21 ° C. At what time you need a higher temperature, you can change the ratio of salt to ice or a vessel with a solution surrounded by ice or snow, which is simply sprinkled with salt.
1.5 part of calcium chloride ( CaCl 2 x 6H 2 0 ) and 1 part of snow are mixed together . This mishmash can reduce the temperature down to -55 ° C.
Concentrated sulfuric acid also snow.
Solid carbon dioxide (dry ice) in a mixture with ether ( C 2 H 5 OC 2 H 5 ) has a temperature of -78 ° C. Instead of the ether, you can use acetone or even denatured alcohol.
Mix 1 part of ammonium nitrate with 1 part of the snow. Achievable cooling down to -20 o C.