Chemistry

Lab Report

Title: The Concept and Measurement of Density

Purpose: To gain an understanding of the physical property of density. To gain skill in measurement of mass and volume, in addition to the construction of graphs and the physical interpretation of slope.

Procedure:

Part 1 Regular solids

1. Use the metric ruler to determine the length, width, and height of aluminum and iron cubes to the nearest 0.5cm.

2. Use the balance to measure the mass of each item listed above to the nearest 0.1g.

Part 2 Water Displacement

1. Obtain a 50.0mL graduate cylinder and determine its mass to the nearest 0.1g. Record in the appropriate space on your data sheet.

2. Fill the graduate cylinder to the 30.0mL mark with tap water. Remember to read the bottom of the meniscus. This is the initial volume, V initial. Place the aluminum cylinder and note the final volume, V final. Record the mass of the aluminum cylinder, water, and graduate in the data table.

3. Repeat step 2, filling the 50.0mL graduate cylinder to the 30.0mL mark with tap water, tilt and slowly slide the irregular solid to the bottom. Record the initial and final volumes in the data table. Record the mass of the solid, water, and graduate in the table.

4. Fill the graduate cylinder to the 30.0mL mark with tap water. Remember to read the bottom of the meniscus. This is the initial volume, V initial. Record the mass of the graduate in the row labeled graduate+water+0 pebbles. Repeat this step with 10, 20, and 30 pebbles.

Part 3: Liquids

1. Obtain a container of solution A, and pour it into the graduate cylinder to the 20.0mL mark. Use a dropper pipet to obtain an exact reading.

2. Place upon the balance and record the mass to the nearest 0.1g.

3. Increase the amount of A to 30.0mL and find the mass again.

4. Increase the amount of A to 40.0mL and find the mass again.

5. Increase the amount of A to 50.0mL and find the mass again. Return A to its original container.

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