LAB 03: Density Collette J. Taylor CHM1025c-4322 October 5, 2019 “The purpose of this experiment is to determine the density of tap water at room temperature to be the similar to the actual density, the mass of sodium chloride solution, and to determine the material built up of pennies through its density.”
Title: LAB 03: Density Material: Pennies (7) Centigram or milligram balance Various glassware (10.00 volumetric pipette and flask, beaker etc.) Sodium chloride Procedure and Apparatus: Measurement of Pennies 1. Seven random pennies were selected for measuring their mass. The balance was tared or zeroed properly before measurement. 2. The smallest graduate cylinder that can fit seven pennies was filled with water. The cylinder was filled to 10.0 ml of water and measured by reading the bottom of the meniscus. 3. The 7 pennies were then added to the cylinder with 10.0 ml water, by sliding it down the side of the cylinder. 4. Gently shake the cylinder to remove bubbles out of the water. The new volume of the water was then measured. 5. This procedure was then repeated two more times. 6. After finishing all 3 separate measurements, the average and standard deviation was then calculated. Please see Calculation section for details. Measurement of Water 1. Using a 10.0 ml volumetric pipette, retrieve a 10.0mml volume of tap water. 2. Tared or zero the balance, then measure the mass of water. 3. Repeat process two more times 4. After finishing all 3 separate measurements, the average and standard deviation was then calculated. Please see Calculation section for details.
Data: Fig. 1.
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- Fall '19