Question

Before coming to the lab session think about how one can design an experiment to measure the latent heat of the ie water phne transition and the latent heat of the steam-water phase transition Your experimental design should be realistic enough to work iw laboratory settings. Describe your kdeas in such a way that it is clear what exacty you will be measuring and how one can caate the latent heat based of that. You may find some hints in this laboratory manual

Answer 1

Energy is required to change water from a solid to a liquid, i.e. to melt ice. In this experiment you will try to measure the latent heat of fusion of ice (LHice), the energy needed (per gram) to melt ice. The needed energy will come from a cup of warm water. The amount of water and its temperature will be measured before adding some ice and then again after the ice has been melted. These data will be used in an energy balance equation to determine Latent Heat of ice.

The specific heat of water is 1 cal/gm ^oC. You can plug this value together with your measured values for Mwater, Mice, Tinitial and Tfinal and solve for LHice.

The known value for the latent heat of fusion of ice is 80 calories/gram.

For the second part of the lab, we again filled the metal can with stirrer about two thirds full with room temperature water and measured the total mass. We took an initial temperature reading for the water in the can and recorded it in our data tables. We put the can with stirrer into the calorimeter and sealed it with the thermometer sensor submerged. We then attached the steam generator to the calorimeter by submerging the steam output hose into the water in the can via the opening in the calorimeter. We turned the steam generator on and monitored the temperature. When the temperature reached a steady state, it was an indication that the water had reached equilibrium with the steam. We then took the final temperature reading and recorded it in our data tables. We then turned the steam generator off, and after waiting for the calorimeter to cool, we removed the metal can with water and stirrer and measured its total mass with the added mass of the condensed steam. We recorded our results in our data tables. We then repeated this process in a second trial to try to obtain more accurate results. We then input our data into the given formulas for the experiment and compared these results to the given theoretical values.

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