Go to Top Precautions Placing a thermometer in an ice bath colder than the low temperature reading limit on the thermometer may cause the thermometer to break. Use caution with hot objects. The contents of the ice salt bath may be allowed to reach room temperature and then flushed into the sink with running water. Unused dry ice may be set into a hood to sublime. All salts will ultimately depress the freezing temperature reached by the mixture.
Some salts are better choices than others since their dissolving is endothermic.
Calcium chloride, however, has an exothermic heat of dissolving and is not an appropriate choice. Identify and explain several factors that might account for differences between the observed and accepted values. Explain how the apparatus and the class's experimental graph could be used to determine the temperature of a swimming pool without a thermometer. Measure pressure with the bulb of the apparatus immersed in the pool. Go to Top Application On a hot day, when a racing bicycle is left in the sun, its tires may explode.