By Rothe, R.E.; Lockheed Idaho Technologies Co., Idaho Falls, ID (United States); United States. Dept. of Energy.; Idaho National Engineering and Environmental Laboratory.; United States. Dept. of Energy. Office of Scientific and Technical Information
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28. How do you determine the equilibrium temperature of the hot solidcold water mixture in the calorimeter? How do you determine the temperature changes for the hot solid and the cold water? Should these temperatures be recorded in the Lab Report and to how many significant ﬁgures? 29. What calculations are required to determine the speciﬁc heat of the unknown solid? From the results of Trials 1 and 2, determine the average speciﬁc heat of the unknown solid. 30. Using the information provided in Table 1, identify the unknown solid.
2. Calculate the stoichiometric ratio for the mass loss of CO2 and H2O per gram of NaHCO3. 3. Determine the total mass loss of CO2 and H2O after three heating-cooling cycles. 4. Determine the mass of NaHCO3 in the mixture. 5. Determine the percent by mass of NaHCO3 and KCl in the mixture.
2 E X P E R I M E N T 2 Post-Laboratory Questions 1. In Step 13 of the procedure, you were instructed not to let the thermometer touch the bottom or the walls of the test tube when heating the unknown solid. Why was this instruction given? ß 2010 Brooks/Cole, Cengage Learning 2. 0 grams of solid B are each heated to 200 8C. Each solid is added to different beakers containing 25 grams of water at 25 8C. The equilibrium temperature of solid A is signiﬁcantly higher than that of solid B.