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PROBLEM: What is the specific latent heat of fusion of ice? How does this value compare with the accepted value? MATERIALS: I) large styrofoam cup 3) ice cube 5) paper towel 2) thermometer 4) hot water 6) electronic balance PROCEDURE: a) Find the mass of a large styrofoam cup. b) Fill the cup approximately half full with hot water. Measure the mass of the cup plus the water. ") Subtract (a) from (b) to get the mass of the hot water. d) Find and record the temperature of the water. e) Measure the mass/temperature of an ice cube. Add it to the hot water. Stir the mixture continuously. Measure the final temperature as soon as the ice is melted. Pay close attention to starting temperature of hot water, and final temp of everything, ensure you give lots of time before you add the ice for the thermometer to settle at a start temperature for the hot water, and mix the solution after you add ice consistently until the temperature stops moving for 10 seconds OBSERVATIONS: Mass of large styrofoam cup: _4.0g Mass of styrofoam cup and hot water: 45g Temperature ('C) Spec. Heat Heat Exchange Components Mass Initial Final Change Capacity () of Mixture (kg) (J/g C) 0.041 80'C 37'C -43'C 4180 Hot Water 15'C Ice 0.013 -15'C 2080 (warming to 0.013 Cold water 43'C 43*C 4180 (melted ice) 0,013 Ice (fusion) CALCULATIONS: 1. Calculate the heat lost by the hot water (Qnew.). the heat gained by the Ice (Qur), and the heat gained by the cold water (Qours.). which starts as Ice. Add your values to the table. 2. Using the following equation, determine the amount of heat (Q,.) that was required to melt the ice cube. Add your value of Qrucke er & to the table. 0 = pressed + worked (Conservation of Energy) - Released " Absorbed - Hot Water = Qice + 2 Fusion of Ice + cold Water - Hot Water - ice - Cold Water =Fusion of Ice 3. Determine your experimental latent heat of fusion of ice (L ) . use the following equation: Fusion of Ice = ml (show your work) QUESTIONS: 1. Create a Temperature vs. Time graph for this lab. Include two lines. one for the Ice/Cold Water, and another for the Hot Water. Your start/end temperatures on the graph should reflect the values in the lab, but your time scale does not need to be indicated. For the graph. imagine that while energy is transferred between the Hot Water and the Cold Water/Ice, that they theoretically remain separate, and don't physically mix. 2. The accepted value for the specific latent heat of fusion of ice is 333 kJ/kg. Determine the % error of your value from the accepted value.. 3. Discuss three sources of systematic and random error that would account for possible % error in #2. Post lab Questions: 4. Explain what is happening to allow the surrounding water to decrease in temperature (lose thermal energy). while the ice melts but remains at OC? Again, we need to adopt a theoretical scenario like in questions #1. 5. Calculate the heat required to convert 50.0 g of ice, initially at -10.0 "C to water at 80.0 "C. Use the accepted
