Question

Can someone please paraphrase this to me in short sentences...

1. Obtain a benzoic acid pellet, determine the mass of the pellet on the analytical balance and record the mass in your hard covered note book. The error for the analytical balance is  0.0005 g. Attach approximately 10.0 cm of fuse wire as shown by your Instructor (use the length of the card that holds the fuse wire, the card is already calibrated in heat units, cal or 4.18 J units) and adjust it to give firm contact with the benzoic acid pellet. Avoid kinks in the fuse wire.

2. Carefully assemble the bomb, keeping surfaces of closure scrupulously clean. Dismantled parts should be placed on a clean, dry paper towel. Place the bomb on the bench next to the O2 cylinder. Tighten cover by hand. The Instructor must assist you in connecting the bomb to the O2 cylinder, and slowly admit oxygen to a final pressure of 20 atm (280 psi.) Close valves on cylinder. Relieve pressure in line by means of the black knob on the regulator. Remove the gas coupling and check the circuit again.

3. Place the bomb in the calorimeter and make sure the ignition wires are connected properly. Carefully fill the inner reservoir in the calorimeter with 2000 mL distilled water, using the volumetric flask provided. The water should completely cover the bomb; no oxygen bubbles should escape from the bomb if the seal is good. If there is a substantial leak, the bomb should be dried and refilled with oxygen. Small leaks are insignificant.

4. Connect the motor and pulley experiment with the o-ring provided and starts the stirrer. Connect the leads on the outside of the bomb jacket to the 10 cm fuse in the igniter

. 5. Turn on the stirrer. For this, data points should be collected every ten seconds up to a total of 150 data points.

6. After at least 12 data points have been collected, and the temperature is reasonably constant or shows only a small up- or downward trend, press and hold the ignition button on the ignitor for approximately 1second. You will see the red light on the ignition box flash on and off again, showing that the fuse wire has burned. You should NOT be standing over the bomb while igniting the bomb!! Stand back from the bomb for at least 15 seconds. If combustion has occurred, the temperature will start to rise within the next two or three data points.

7. Keep recording data until the 150 points finishes.

8. Remove the bomb from the calorimeter and relieve the pressure by opening the valve. BE SURE to open the release valve before trying to unscrew the top of the bomb! 9. Measure the remaining length of unoxidized fuse wire. (This information is needed to correct for its heat of combustion). Carefully clean and dry the calorimeter and sample pan.

10. Repeat this procedure with the second benzoic acid pellet.

11. Once you have good data for benzoic acid, allowing you to calculate the calorimeter constant C, repeat the full procedure for each of the two sucrose samples.