Name: ID #: Quiz Section: Chem 152 Experiment #4: Thermodynamics I (Calorimetry) By signing below, you certify that you have not falsified data, that you have not plagiarized any part of this lab report, an calculations and responses other than the reporting of raw data are your own independent work. Failure to sign this dec in 5 points being deducted from your report score. Signature: Total Points = 60 pts (10 notebook, 50 report) DATA AND CALCULATIONS A: Heat Capacity of the Calorimeter Run 1 Voltage, V (J/C) Current, A (C/s) Time (s) Initial temperature, oC Final temperature, oC *Energy into calorimeter from power supply, (q), J *Heat Capacity of Calorimeter, Ccal, J/oC *Type an example of the calculations you are performing for q and Ccal. (3 pts) B: Enthalpy of Fusion of Water Run 1 Ccal(Average), J/oC Mass of calorimeter, stir bar and water, g Mass of calorimeter, stir bar, and water + mass of added ice (or melted ice), g Mass of ice, g Temperature of calorimeter before ice addition, oC Temperature of ice before addition to the calorimeter, oC Temp. of the calorimeter after addition and melting of the ice, oC Tcal * (a) Heat lost by calorimeter (q cal in J) water from ice Specific heat of water, J/g.oC Heat gained by ice cube to warm water * (b) from ice temperature (q in J) *(c) Enthalpy of fusion of ice, H fusion in J/g Average H Standard Dev Run 2 C: Enthalpy of Neutralization of HCl and NaOH NaOH Concentration HCl Concentration M M Run 1 Run 2 Ccal(Average), J/ C o Tinitial (HCl), ˚C Tinitial (NaOH), ˚C Tinitial (average), ˚C Tfinal , ˚C ∆T, ˚C * (a) Moles H2O formed in reaction * (b) q (J) (magnitude of heat gained/lost ) * (c) ∆H neutralization (kJ/mol) Average ∆H neutralization, kJ/mol Standard Dev D: Enthalpy of Neutralization of Acetic Acid and NaOH NaOH Concentration Volume Used M mL Acetic acid Concentration Volume Used M mL Run 1 Ccal(Average), J/ C o Tinitial (acetic acid), ˚C Tinitial (NaOH), ˚C Tinitial (average), ˚C Tfinal , ˚C ∆T, ˚C Moles H2O formed in reaction q (J) (magnitude of heat gained/lost ) ∆H neutralization (kJ/mol) Average, ∆H neutralization, kJ/mol Standard Dev Run 2 E: Enthalpy of Hydration of Magnesium Sulfate Run 1 Run 2 Ccal(Average), J/ C o Mass MgSO4 added, g * (a) Moles of MgSO4 Tinitial, ˚C Tfinal , ˚C ∆T, ˚C * (b) q (J) (magnitude of heat gained/lost ) * (c) ∆H solution (kJ/mol) Average, ∆H solution, kJ/mol Standard Dev Run 1 Ccal(Average), J/oC Mass MgSO4∙7 H2O added, g Moles MgSO4∙7H2O Tinitial, ˚C Tfinal , ˚C ∆T, ˚C q (J) (magnitude of heat gained/lost ) ∆H solution (kJ/mol) Average, ∆H solution, kJ/mol Standard Dev * (d) Enthalpy of Hydration Run 2 RESULTS AND DISCUSSION 1. If Ccal =Ccup + Cwater, calculate Ccup and Cwater for this experiment Hint: Use heat capacity of water *Cwater *Ccup 2. What would Ccal have been if you had used * 50 mL (or 50 g) of water instead? 3. The literature value for the enthalpy of fusion of water is 334 J/g. Calculate the % error for your result. (3 pts) 4. How would a different mass of ice affect the determination of the enthalpy of fusion? Explain. (3 pts) 5. According to the Zumdahl textbook, the enthalpy of neutralization for a strong acid and strong base is -58 kJ/m value compares with this literature value (calculate the % error and comment on the comparison)? (3 pts) 6. What is the biggest source of error in the enthalpy of neutralization measurements performed in this experime 6. What is the biggest source of error in the enthalpy of neutralization measurements performed in this experime 7. What, if any, is the effect of acid strength on the enthalpy of neutralization? (3 pts) 8. Suppose your thermometer is off by 1.5 oC i.e. it reads values that are 1.5 oC higher. How would this affect the Laboratory Waste Evaluation (1 pt) Laboratory waste is considered anything generated during an experiment that is disposed of down the sewer drain, thr by the UW Environmental Health & Safety department, or released into the environment. Based on the written lab pro approximate amount (mass or volume) of waste that you generated while performing this experiment. Laboratory Waste Evaluation (1 pt) Laboratory waste is considered anything generated during an experiment that is disposed of down the sewer drain, thr by the UW Environmental Health & Safety department, or released into the environment. Based on the written lab pro approximate amount (mass or volume) of waste that you generated while performing this experiment. Quiz Section: Lab Partner: s I (Calorimetry) plagiarized any part of this lab report, and that all dependent work. Failure to sign this declaration will result Note: All sections of this report must be typed Data Entry Run 2 Run 3 Average, Ccal Standard Dev Help with Formulas in Excel In Excel type "=average(range of values)" but instead of entering a range, just click at one end of the values and drag mouse to the other end. For standard deviation, in Excel type "=stdev(range of values)". 2 pts *Type examples of the calculations you perform for the following: (a) q cal (2 pts) (b) q for heating the water that was ice (warming melted ice) (2 pts) (c) Hfusion (melting the ice) (2 pts) J/g J/g Volume Used Volume Used mL mL *Type examples of the calculations you are performing for (a) moles of H2O produced by HCl/NaOH reaction (2 pts) (b) the magnitude of the heat gained/lost (2 pts) (c) Hneutralization (2 pts) 6 pts *Type examples of the calculations you are performing for performing for (a) moles of solid (2 pts) (b) the magnitude of q (2 pts) (c) H solution (2 pts) (d) overall H. (2 pts) 5 pts kJ/mol *Type the calculations you are performing for Ccup, Cwater, and the new Ccal. (6 pts) J/oC J/oC J/oC ate the % error for your result. (3 pts) py of fusion? Explain. (3 pts) trong acid and strong base is -58 kJ/mole (see section 9.4 in Zumdahl). Explain how your nt on the comparison)? (3 pts) surements performed in this experiment? (3 pts) surements performed in this experiment? (3 pts) n? (3 pts) 5 oC higher. How would this affect the results in this experiment? (3 pts) s disposed of down the sewer drain, thrown in the garbage, collected in a container for disposal ironment. Based on the written lab procedure and your actions during the lab, list the identity and rming this experiment. s disposed of down the sewer drain, thrown in the garbage, collected in a container for disposal ironment. Based on the written lab procedure and your actions during the lab, list the identity and rming this experiment.