Safety Equipment: Safety Goggles, Lab Coats, Gloves Procedure: I.Equipment Setup A.Construct simple calorimeter from two Styrofoam cups as shown in Figure 1 below. Insert the thermometer and stirring rod into the lid of your calorimeter. The thermometer should go
EXPERIMENT I:THERMOCHEMISTRY 5 Figure 1. Styrofoam cup calorimeter B. Plug the thermometer into the MeasureNet Device and prepare the device for measurements using the following instructions. i. Turn the MeasureNet Station on by pressing ON/OFF ii. Press Main Menu iii. On the menu, you will see the option F2 – Temperature. Press F2 to select this option. iv. A new menu will appear and on this menu you will see the option F1 – Temp v. Time. Press F1 to select this option. v. Calibrate the MeasureNet Thermometer a) Fill a 100 mL beaker with approximately 50 mL of room temperature water. b) Obtain an alcohol thermometer and place in the beaker filled with water. Let the thermometer rest in the water until the temperature measurement has stabilized. Do not let the thermometer sit on the bottom of the beaker . c) Place the MeasureNet thermometer into the beaker filled with water (the alcohol thermometer remains in the water as well). d) Press Calibrate e) Enter the temperature from the alcohol thermometer (to the nearest decimal place) into the MeasureNet Device. f) Press Enter vi. Press Display II. The Heat of Solution A. Using a graduated cylinder, measure 50.0 mL of room temperature deionized (DI) water and add to the calorimeter assembled in Part I. Cover the calorimeter with the lid and let the water sit for
6 EXPERIMENT I:THERMOCHEMISTRY 3-4 minutes until the temperature of the water remains steady.Record the temperature of the water (Ti) from the MeasureNet display on the provided data sheet.B.Weigh out ~3 g of ammonium nitrate (NH4NO3). Make sure to record the mass using all significant figures on the balance display on the provided data sheet. C.Quickly add the ~3 g of NH4NO3 to the calorimeter. Ensure that the lid of the calorimeter is replaced immediately and gently stir the solution with the stirring rod. D.After the solution has equilibrated, record the final temperature (Tf) shown on the MeasureNet display on the provided data sheet. E.Drain the solution in the calorimeter into the appropriate labeled waste container in the hood (aqueous waste). Rinse the calorimeter with DI water and dry it.F.Rinse the MeasureNet thermometer with DI water and dry it. III.The Heat of Neutralization – Strong Acid with a Strong Base Caution!! HCl is a strong acid and NaOH is a strong base. In case of contact, immediately inform your TA and begin rinsing with water. In case of spills, immediately inform your TA. A.
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