lab 02 for chem pre lab - unknown metal. Place some in the...

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Dan Ortiz Purpose 1. Examine the intensive property, density. Methods to determine the density of both a solid and a liquid will be used. Identify the unknown as well. Also will determine the concentration of an unknown salt solution by graphically comparing it to the concentration of known solutions. Materials 2. 10 ml graduated cylinder, 100 ml graduated cyl. 25 ml. flask, 4-50 ml beakers, pipet, stirring rod. Coding dots. Procedure Part. A : calibration of cyl. 1. Weigh 10 ml cyl. To nearest .01 gram, and record weight. Fill gc with water and use pipet to adjust the meniscus to read exactly 10 ml. weigh the cylinder to .001 gram and record the weight after you dry the outside surface of the cyl. Determine the vol. of the gc by using the known density of water. Empty and repeat. This is the value used for the cyl. In further experiments. Part B: determine density of the unknown 1. Obtain an unknown and record its number on your data sheet. Clean and dry your
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Unformatted text preview: unknown metal. Place some in the 10 ml gc. Weigh the cylinder with the metal to nearest .01 gram and record. Add water and using the pipet adjust the volume to exactly 10 ml.weight the cylinder with the unknown sample to its original container. Determine density of the unknown metal and record. Then use table to identify unknown metal. Part C : determination of salt solution 1. Obtain a sample of each NaCl solutions. 5, 10 ,15, 20 percent by weight. 2. Clean and dry 10 ml gc 3. Fill cylinder to exactly 10 ml. with 5 ppercent 4. Dry outside and weigh to .01 gram 5. Record 6. Repeat 7. Find density 8. Make a graph density (y) vs % composition ( X). 9. 25 ml flask, obtain unknown from the storeroom. 10. Record data 11. Repeat 2-5 uknown 12. Determine density 13. Determine percent comp. of unknown and record Safety Broken glass, wear glasses....
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lab 02 for chem pre lab - unknown metal. Place some in the...

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