1A_experiment_density

# Mass bulk volume density the mass of dry sand divided

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mass bulk volume Density = The mass of dry sand divided by its observed volume yields its bulk density. The absolute density of sand is mass divided by absolute volume. The absolute volume is the actual volume of the particles themselves. mass absolute volume Density = The absolute density is used to identity the nature of a substance. The densities given on tables of densities are absolute densities. Any time the term density is used, you can assume it refers to absolute density unless otherwise stated. PROCEDURE Determination of the Bulk Density of Sand a. Weigh a 10-mL graduated cylinder. Report all your data on the data sheet at the end of the experiment. (Report all masses for this experiment to 0.001 g.) b. Add enough sand to the graduated cylinder to bring its bulk volume to about 5 mL. c. Weigh the cylinder and the sand and record the mass to 0.001 g.

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288 Lab Manual Identification by Densities d. Calculate the mass of the sand by subtracting the mass of the cylinder from the mass of the cylinder and the sand. This is called “weighing by differences.” e. Read and record the bulk volume to 0.1 mL. (Do not tap the sand down. If the sand is packed too tightly, there will be problems in the next steps.) f. Calculate the bulk density of the sand. Determination of the Absolute Density of Sand a. To the graduated cylinder containing the sand used in the previous section, add enough deionized water to completely cover the sand. b. With the aid of a microspatula, make sure that all of the air is eliminated. c. If any sand is left adhering to the microspatula or the walls of the cylinder, rinse them down with some additional water. It is important that the water level does not come above the 10.0 mL mark on the graduated cylinder.
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