# Exp3a_Unknown element_Density.pdf - Exp 3A Identification...

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Exp. 3a: Page 1 of 4 Leo Truttmann – Fall 13 Exp. 3A: Identification of an Unknown Element by its density Required Locker Materials: - 50 ml Erleneyer flask - Rubber stopper with glass tube - 400 ml beaker Safety: - Safety eyewear: NOT NECESSARY Waste: - No waste produced Experimental Objective: The objective of the lab is to determine the density of an unknown metal by using a pycnometer. The students will learn to set up a pycnometer by using simple lab ware. In part A students determine the volume of the pycnometer and in part B the density of the unknown metal is measured. Procedure (Part A) Determine the volume of the pycnometer For this experiment record all observations and measurements in your notebook: 1. Obtain about 250 ml of distilled water in a 400ml beaker and let sit at room temperature for 15 minutes. Record the temperature of the water with a thermometer from the lab bench. 2. Set up a pycnometer by putting a rubber stopper with a glass tube on a 50ml Erlenmeyer flask. 3. Weigh the dry flask and stopper on the balance. (this value only needs to be measured once throughout the experiment, because the mass of the pycnometer should not change) 4. Fill the pycnometer flask with distilled water, insert the stopper, and push until the water rises to the top of the tube. Wipe off excess water droplets and then reweigh the flask and its contents. Remove the stopper, empty the flask, refill with water and repeat the weighings two more times.

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