Chem 105 Lab1

Objectives

The objective of this lab is to gain knowledge about the process of finding the chemical formula of a specific compound. This is done by conducting a reaction of a mixture, then using the results to determine the mass and moles of the two substances in the mixture. Then using this data, calculate the empirical formula and the chemical formula.

Materials and Equipment

Unknown

* Unknown compound of solid copper chloride hydrate

Equipment

* Crucible with cover

* Crucible tongs

* Spatula

* Ring stand with clay triangle

* Lab burner

* 50mL beaker

* Bucher funnel and filter mask

* Filter paper

* Watch glass

* Aluminum wire

* 6M hydrochloric acid

* Distilled water

* Wash bottle

* Balance

* Glass stirring rod

* Drying oven

Other

* Safety Glasses

Procedure

During all procedures in the lab, safety glasses must be used.

1. Measure and record the mass of a dry crucible without cover. Get about 1g of the unknown and place into crucible. Break up large chunks of the unknown with the spatula. Weigh and record the mass of the crucible plus the unknown sample.

2. Obtain and setup a ring stand and clay triangle, Put the crucible on the clay triangle. Set up a Bunsen burner and light it away from the sample, adjust the flame for proper heating.

3. Hold the bottom of the burner in your hand while slowly making passes beneath the substance heating it till all the blue-green color is gone. After the blue-green color is gone heat the substance for an additional two minutes.

4. Turn off the burner and cover the crucible and allow for the crucible to cool for about ten minutes.

5. Remove the crucible cover and inspect your sample. If you see any blue-green crystals, reheat the sample until the crystals have turned brown.

6. Measure and record the mass of the cool crucible of your copper chloride sample.

7. Transfer the brown solid to a clean and empty 50 mL beaker. Rinse out the...