CHEM 121 Lab 2 Density Determination (Portage learning)

Title: Density Determination Purpose: Familiarize methods to obtain densities of different objects. Explore accuracy and precision within two different methods of measuring density. Procedure: Measurement of densities of water at room temperature (21.4 degrees C). In order to calculate the density, the volume and mass of the items in each experiment were recorded. Note: accepted value of water density at room temperature is 0.997904 g/ml. Equipment: balance, pipette, beaker. A beaker was placed on a balance, and tared. 10 ml of water was measured in a pipette and poured into the beaker to measure the mass. The mass of this amount of water was noted to be 9.83g. An additional 5 ml was measured with a pipette and poured into the same beaker, measuring a mass of 15.54. Lastly, 10ml more of water was measured and poured into the beaker in the same way, recording a mass of 25.49 g. Using the density formula, D=M/V, we calculate the densities of the water in the experiment for each recorded volume. The mass for the initial 10 ml of water was 0.983, mass for 15 ml of water was 15.54 g/ml. Another 10 ml was added into the beaker for a total of 25 ml and a mass of 24.5g. Density of animal products. Equipment: cow bone, suet, chicken breast,