Part C Heat of Neutralization of Sodium Hydroxide Solution with Hydrochloric

Part c heat of neutralization of sodium hydroxide

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Part C: Heat of Neutralization of Sodium Hydroxide Solution with Hydrochloric Acid 22. Using a 50.0 mL graduated cylinder measure out exactly 50.0 mL of the 2.0 M HCl (aq) solution. Place a regular thermometer (not the temperature probe) into the graduated cylinder. 23. Using a second 50.0 mL graduated cylinder measure out exactly 50.0 mL of the 2.0 M NaOH (aq) solution. Place a regular thermometer (not the temperature probe) into the graduated cylinder. 24. After a few minutes check to see that the temperatures of each solution are the about same (within 0.5 o C). If not, wait a few more minutes. 25. Pour the NaOH (aq) solution into the calorimeter. Turn on the switch that controls the stirring mechanism and stir the solution at a moderate speed. 26. Tap on the file cabinet icon to start run 4. Tap the green arrow, , in the lower left of the screen to start data collection. 27. Keep your eye on the time (lower right of screen). At the 3.5 min mark get ready to add the HCl solution to the NaOH solution. Lift the lid up carefully but do not move the temperature probe. 28. At the 4 min mark add the HCl as quickly as possible, and then replace the lid. You should see the temperature rise rapidly. You do not need to stop the data collection. LabQuest will stop automatically at the 10 min mark. 29. Follow steps 9 – 11 as outlined above, and be sure to record all relevant data in your lab notebook. 30. It is vital that you wipe off all traces of solution from the temperature probe. Use a wet paper towel to do this several times over, and then wipe dry. Any traces of acid or base will corrode the temperature probe.
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9 31. Rinse the styrofoam cups, thermometers, and magnetic stirrer bar with DI-water and leave them the way you found them on the lab bench. 32. Delete any stored data from LabQuest by tapping the “File” menu with the stylus and selecting “Quit”. The LabQuest should be left turned on for the next lab section. If the lab is scheduled to end at 4:50 PM or 8:20 PM then the LabQuest should be turned off by pressing the silver button on the top left of the device. 33. Hand in the yellow copy of your data sheets to your instructor before you leave the lab. DATA SHEET Part A: Heat of Solution of LiCl and NH 4 Cl Mass LiCl ____________ Mass of Water ____________ Mass of Solution ____________ Initial Temperature, T i ____________ Equation of straight line ________________________ Final Temperature, T f ____________ (show calc. on the right) Δ T (= T f – T i ) _____________ Heat, q Soln (in kJ) _____________ (show calc. on the right) Δ H rxn (in kJ/mol) ____________ (show calc. on the right) Mass NH 4 Cl ____________ Mass of Water ____________ Mass of Solution ____________ Initial Temperature, T i ____________ Equation of straight line ________________________ Final Temperature, T f ____________ (show calc. on the right) Δ T (= T f – T i ) ____________
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10 Heat, q Soln (in kJ) ____________ (show calc. on the right) Δ H rxn (in kJ/mol) ____________ (show calc. on the right) Part B: Heat of Reaction for Magnesium and Hydrochloric Acid Mass Mg ____________ Mass of HCl (d=1.00g/mL) ____________ Mass of Solution ____________ Initial Temperature, T i ____________ Equation of straight line ________________________ Final Temperature, T f ____________ (show calc. on the right) Δ T (= T f – T i ) ____________ Heat, q Rxn (in kJ) ____________ (show calc. on the right) Δ H Rxn (in kJ/mol) ____________ (show calc. on the right) Part C: Heat of Neutralization of Sodium Hydroxide Solution with Hydrochloric Acid Molarity of NaOH ____________
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