Final experiment 3

Final experiment 3 - Experiment No 3 Density Determinations...

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E xperiment No. 3 – Density Determinations Chemistry 1411.P06 - General Chemistry I South Texas College Summer I 2016 Dr. RCC GONZALES By: Jissel Velasquez & Michelle Vargas

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Objective: The purpose of this experiment was to calculate the density of solids with regular and irregular shapes, pure liquids, and unknown solutions. Materials Used: Distilled water, electronic balance, metal pellets, unknown liquid sample, rectangular block, sodium chloride, thermometer, triple balance beam, 100-mL graduated cylinder, and 25-mL graduated cylinder. Summary of Procedure: A. Determination of the Density of Solids Obtain a rectangular box and measure its length, width, and height to the nearest 0.2 mm in order to determine the volume. Determine the mass of the solid. Based from the calculations made from the mass and volume, the density of the block is determined. Grab approximately a 50g sample of metal pellets and record and weigh sample to the nearest milligram. In a 100-mL graduated cylinder, record the initial volume and add the metal pellets and water to approximately the 50-mL and record the new volume. Calculate the density of the metal sample then removed from the graduated cylinder and return the sample back to the instructor. B. Density of Pure Liquids: Attain a 25-mL graduated cylinder and weigh to the nearest mg. Add distilled water into the graduated cylinder between the 20-mL mark and 25-mL mark. Determine the temperature of the water by using a laboratory thermometer. Reweigh the graduated cylinder approximately to the nearest milligram and record its volume. Compare the density of the water to the value listed in the handbook. Attain an unknown liquid and repeat the steps as the previous experiment. C. Density of Solutions: A solution of sodium chloride will be prepared with distilled water. The following prepared percentages would be 5%, 10%, 15%, 20%, 25%. Prepare 25 ml of each solution. Determine the weight between the solute and solvent to the nearest milligram. Determine the density of each sodium chloride solutions while recording the temperature. Make a graph that describes the relationship between densities versus percentage of NaCl. Use the handbook of chemical data to compare the true density of the solutions and calculate the percent error.
• Fall '15
• villareal
• Chemistry, Sodium chloride, ml, south texas college

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