Title:

Freezing and Melting of Paradichlorobenzene

Goal:

Melting, freezing, and boiling points are houses that can conveniently be decided and help in identifying a substance. These types of properties can be obtained from chemical books ad reference tables, and is used to identify a real substance by many other real substances. In this lab you can use the real substance Paradichlorobenzene and identify its melting an cold points by warming and cooling a sample of the element, then plotting heating and cooling figure and inspecting them. Info that you gather will symbolize the cooling and heating behavior common to all real substances.

List of Supplies:

-Large Check Tube (18*15 mm) -Safety goggles-Paradichlorobenzene -Hot Plate -Lab Apron-Acetone

-Test Tube Holder -Ring Stand

-2 Thermometers -A Ring Clamp

Treatment:

1 . Produce a data stand with titles for period, temperature of Paradichlorobenzene, and temperature of water. 2 . Fill a 250mL beaker about 3/4th full of cool tap water. Create a thermometer inside the beaker and record the temperature towards the nearest 0. 2C three or more. Obtain a check tube containing solid Paradichlorobenzene from your educator and softly heat quality tube more than a medium Bunsen burner fire. Move test tube out-and-in of the fire at a small angle. 5. Once the Paradichlorobenzene has dissolved, remove it from your flame and shut the gas valve off. your five. Before moving forward to component I, complete another 250mL beaker 3/4th full of cool tap water and begin to heat up a warm plate about medium to high heat.

Part I - Cooling of Paradichlorobenzene

6. Put a thermometer in the test conduit of melted Paradichlorobenzene. Record the temp in your data table. six. Lower the test tube in the beaker of water until all of the Paradichlorobenzene is below water. Batten the clamp onto the ring stand. 8. Wait 30 seconds. During that time, mix the Paradichlorobenzene by...

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