Density Lab - Results and Discussion The densities of an...

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Results and Discussion The densities of an unknown solid and an unknown liquid were obtained by calculating the ratios of their mass and volume values found in experimentation. Four trials were conducted to obtain mass and volume measurements for the solid and for the liquid. The procedure used in obtaining the mass and volume values for the unknown liquid was first tested on liquid water and found to be a valid procedure. A sample of water was found to have a mass of 9.959 g and a volume of 10.00 mL. The density of the water was calculated to be 0.9959 g/mL, which differs within the realm of acceptable error from the accepted value of 1.00g/mL. In the case of the unknown solid (solid #4), a sample of the unknown solid was placed on an electronic balance to obtain its mass. A 10.00 mL transfer pipet was used to transfer 10.00 mL of liquid water to a 30.0 mL graduated cylinder. The solid sample was then placed in the water in the graduated cylinder, and the new volume was obtained by reading the scale on the graduated cylinder. The raw data from the four trials for the unknown solid are shown in Table 1. Trial # Mass of Solid (g) Volume of Water in Graduated Cylinder (mL) Volume of Water and Solid in Graduated Cylinder (mL) Volume of Solid (mL) Density of Solid (g/mL) 1 10.156 10.00 13.5 3.5 2.9 2 10.155 10.00 13.9 3.9 2.6 3 10.155 10.00 13.5 3.5 2.9 4 10.155 10.00 14.0 4.0 2.5 Observations: solid has hard, smooth, and shiny surface, silver-gray color, and has shape of small cylinder. For each trial, the volume of the solid was obtained by subtracting the volume of the water in the graduated cylinder from the volume displayed when the solid is in the water. An example of this
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This note was uploaded on 10/19/2008 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell University (Engineering School).

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Density Lab - Results and Discussion The densities of an...

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