CALORIMETRY Lab 4: Calorimetry At Home Laboratory

The first experiment looks at the heat of fusion of ice: the amount of heat needed to convert a solid into a liquid at constant temperature and pressure is the heat of fusion of the substance. The molar heat of fusion is the amount of heat energy required to completely change one mole of solid into one mole of liquid at its melting point. In this experiment, the molar heat of fusion of ice was determined experimentally and compared mathematically to its standard value.

Roughly 300mL was heated to about 70oC and 150mL of the warm water was poured into a coffee cup calorimeter. A lid was placed on the calorimeter and a thermometer placed through a hole in the lid into the liquid. Once the thermometer had equilibrated, the temperature of the liquid was noted. One or two pieces of ice were then placed in the liquid, the lid replaced on the calorimeter, and the liquid and ice stirred with the thermometer. The temperature of the water/ice mixture was monitored and the lowest temperature observed was noted. The lid was then removed from the calorimeter and the new volume of liquid measured and recorded. The experiment was repeated for two more trials.

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e start of the experiment were that it was at 0C, and at the end of the experiment that it was all melted and was at equilibrium with the water in the calorimeter. The temperature of the ice was not measured at the beginning of the experiment so may have been higher, which would have made the heat of fusion appear lower. If all the ice was not melted at the end of the experiment, this would have depressed the value found for the heat of fusion. 4. H2O (s) - 6.01kJ/mol ? H2O (aq) Part II Specific heat of metals The amount of heat energy required to raise the temperature of one gram of a substance by one degree Celsius is called the specific heat capacity, or specific heat (Cp). The units of specific heat are cal/goC. Every substance has an accepted value of specific heat for its solid, liquid and gaseous forms. The amount of specific heat needed to change the temperature of a substance depends on some intensive as well as some extensive properties of the substance. The intensive properties that determine the amount of heat energy required are: specific heat of the substance, and the temperature change that the substance goes through. The extensive property that plays a big factor in the amount of heat energy
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Approximate Word count = 1256
Approximate Pages = 5 (250 words per page)