Lab

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Purpose The purpose of this lab was to determine the melting point of p-Dichlorobenzene.

Materials 100ml beakerThermometer

Melting point tubeRubber band

Hot PlateSeveral crystals of p-Dichlorobenzene Help with essay on Lab

Glass RunnerRing Stand

Extension ClampTriple Arm Clamp

Apparatus See Attached Sheet

Procedure

1)Fill a beaker with several pieces of ice and water. Place the thermometer into the ice water submerging the reservoir of alcohol. Keep submerged until the liquid in the thermometer stops its decent. Record the temperature at which the thermometer read.

)Construct the apparatus, (see diagram on other sheet).

)Place the ice filled beaker aside. Turn the hot plate on to a setting of ten. Fill the other beaker with 100 ml of water. Place beaker on the hot plate so the thermometers reservoir is submerged. When the water begins to boil record the temperature.

4)Empty the boiling water and turn the hot plate off so it does not get too hot. Using the melting point tube, collect several crystals of p-Dichlorobenzene. Due this by thrusting the open side into the container of p-Dichlorobenzene. Place the melting point tube open end up into the glass runner. Drop the melting point tube allowing it to slide down the tube forcing the p-Dichlorobenzene to the bottom.

5)Place the thermometer into the ice water until the temperature returns to that roughly of the room.

6)Attach the melting point tube to the thermometer using the rubber band and fill the second beaker will water.

7)Turn the hot plate back up to ten. Place the beaker on the hot plate again submerging the thermometers reservoir.

8)Observe the crystals of p-Dichlorobenzene. As soon as one begins to melt look at the temperature and record it.

)Remove the thermometer and place it into the ice water allowing it to cool and the p-Dichlorobenzene to crystallize. Turn off the hot plate and dispose of the water.

10)Repeat steps seven through nine several more times. Record all data.

Results

Observations

1)The Average melting point of p-Dichlorobenzene is 5.4°C.

)The substance p-Dichlorobenzene can re-crystallize.

)Water boils at 100°C and it freezes at 0°C.

Data

Data collected for the substance p-Dichlorobenzene

Trial 1Trial Trial Avg.

Melting Point in °C5.5.75.65.4

Calculations

Graph See Attached Sheet

Discussion

In conclusion, the substance p-Dichlorobenzene has an average melting point of 5.4°C. Also, p-Dichlorobenzene can re-crystallize, when the temperature gets cold enough. Another conclusion I came to in this lab was that the melting point of p-Dichlorobenzene is lower than the boiling point of water. In addition, its freezing point is higher than that of water.

One source of error could have been the time it took me too first realizes the p-Dichlorobenzene was melting then look at the temperature. This would have raised the temperature which I recorded. Another source of error could have been the re-crystallizing of the p-Dichlorobenzene. It might have changed a slight bit or was more of a liquid than before. This could have raised or lowered my recorded temperature for its melting point. My percent error was .755%.

Real life applications for p-Dichlorobenzene include the fumigation of agricultural fields and for mothproofing clothes. It can be used for these purposes because p-Dichlorobenzene is a toxin that acts as a pesticide.

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