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Procedure Part 1: Latent Heat of Fusion for Water 1. For this lab it is very important that you fully read all instructions before carrying out the activity. Reading only the current or current and next step while doing the lab work could mean missing important time-dependent information. The digital mass scales You will add some ice to a pre-measured amount of warm water and measure the drop in the temperature if water. Heat from the water melts the ice and warms the melt up to the final common temperature. The latent heat of fusion is calculated by equating the heat exchanges between the ice and the water (See equation 3). 2. Go to Pearson's Chemistry Simulations: Calorimetry and carefully read the opening page to which it re-directs you. We will not focus on the chemistry aspects, like molarity of acids and bases. Click on the Experiment tab. In the pop-up window, choose "Run Demonstration" and carefully read and go through the entire demonstration. Make sure you understand what equipment the simulation uses, how to use it, and what this experiment will attempt to explore. Once you have finished the demonstration, click on the Run Experiment button. 3. In the first tabbed area below the glass beaker, go to the Solids tab. Scroll to the end of the list and below "Phase Changes" choose Ice - H₂0 (s). 4. Move the mass slider to a value between 3 and 6 grams of ice. Record this mass value in Data Table 1 as mi. 5. Make sure the temperature slider is at 0.0°C. 6. Click on the Next button. 7. In the second tabbed area below the ideal calorimeter, in the Liquids tab, choose water. 8. Move the mass slider to a value greater than or equal to 90.0 grams. Record this value in Data Table 1 as mw.
9. Move the temperature slider until it is between 35°C -45°C. Record this value in Data Table 1 as T1. 10. Click the Next button. 11. Click on "Show graph view." When ready, click Start. Observe the Graph view, to answer the end of the lab question. 12. Once the reaction completes, record the final temperature as T2 in Data Table 1. 13. Calculate the latent heat of fusion for water using the following equation (which can be deduced by combining equations 1, 2 and 3): Specific heat of water, fis is 1 cal/gC. Remember to show your math work. 4 =1T:-Ty)-mot [4) 14. Repeat the experiment two more times for different M, Mw and T, values and record T, for each case. Calculate the latent heat of fusion for water. 15. Calculate the average latent heat of fusion for water. Remember to show your math work. The standard value of Lffor water is 79.6 cal/g. Calculate the percent error of your measurement. The equation for percent error is: (Experiment -- Standard) 100% % Error = Standard X 1 Table-1 Mass of Ice (MI) 8 Lcoal/g) Mass of water Initial Water (Mws Temperature (T.C) Final temperature (T2°C) 1 1 2 ابها 3 Calculation 1. [work
2. [work] 3. (work) Average {work] Average ſanswer] % Error {work 96 error = {answer Part 2: Specific Heats of Metals 16. In the first tabbed area below the glass beaker, go to the Solids tab and choose Iron - Fe. 17. Move the mass slider to a value between 5 and 15 grams. Record this value in Data Table 2 as mm 18. Move the temperature slider to a value between 40°C -50°C. Record this value in Data Table 2 as Ties - T.. 19. Click on the Next button. 20. In the second tabbed area below the ideal calorimeter, in the Liquids tab, choose water 21. Move the mass slider to a value greater than or equal to 90.0 grams. Record this value in Data Table 2 as mw. Set initial water temperature Tu - 20 °C 22. Click the Next button. 23. Click on "Show graph view and microscopic view." When ready, click Start Observe the Graph view and the microscopic view to answer the end of the lab question. m 24. Once the reaction completes, record the final temperature as Tein Data Table 2. 25. Calculate the specific heat of iron using the following equation. Remember to use specific heat of water. Dis 1 cal/g Cº. Remember to show your math work.
Cm w car (TT) 26. Repeat steps 16-25 for the second metal aluminum. 27. Calculate the percent error of your measurement. Standard Specific Heat for Iron is 0.11 cal/g Cº and for Aluminum 0.22 cal/gCº. Remember to show your math work. 28. Answer the end-of-lab questions. Table-2 Cm Mass of Initial block | Mass of Initial Final Block Temperature water (Mwig Water temperature (Mm) (TMC) Temperature (TTC) (Tw°C) Iron Aluminum Specific heat Calculation Iron [world Specific heat Calculation Al work % Ermar Calculation Iron [work) 9_error = {answer] % Error Calculation Al [work) 96 error = answer