Experiment No3

# Experiment No3 - Experiment No 3 Density Determinations...

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Experiment No. 3 Density Determinations Chemistry 1411 PO5 – General Chemistry I South Texas College Fall 2015 For: Dr. Subrata Mandal By: Brillitt Solis

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a.) Objective Density is an important factor when studying chemistry, and can be used to identification of an object. In this experiment the student will get familiarized with using different instruments to measure density. b.) Materials/Methods The student will need a rectangular prism, ruler, triple-beam balance and electronic balance, metal pellets, cylinder and water, thermometer, a sample of an unknown liquid, and solutions with different concentrations of NaCl. c.) Summary of procedure I. Determination of the Density of Solids Obtain a rectangular prism and record its identification number. Use the ruler to measure the length, width, and height of the prism. From the dimensions calculate the volume. Use the triple-beam balance to get mass of the prism. With the volume and mass determine the density. Gather approximately 50g of metal pellets, and record the actual mass obtained. Add approximately 50mL of distilled water to the 100mL graduated cylinder. Record the exact volume of water in the cylinder. Pour the metal pellets into the cylinder, make sure there is no air bubbles stuck in of the pellets. Record the volume of the water and the pellets. Subtract the volume of the water from the volume obtained of the water and pellets, to find the volume of the pellets. II. Density of Pure Liquids Obtain a 25mL graduated cylinder and use an electronic balance to measure its weight. Pour from 20 to 25 mL of distilled water into the cylinder and determine its temperature using the thermometer. Reweigh the cylinder and record the mass. Record the exact volume of the water. Use the mass and volume to determine density. Compare the calculated density to the density in the handbook. Obtain an unknown liquid and record its identification number. Use the same procedure described before to determine the density of the unknown liquid.

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