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Solubility Curve( chemistry lab report)

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BC: Conclusion | Solubility of a solute is the amount of solute that will dissolve in a given amount of solvent to make a saturated solution. | The solubility of a substance is not constant, it varies with different conditions such as temperature

FC: Chemistry Lab Report

1: Sunshine Christian Bilingual Institute 11th grade Mr. Jose Popoff Solubility Curve 5/11/12

2: Introduction | The solubility of a solute is the amount of solute that will dissolve in a given amount of solvent to make a saturated solution. In this lab we will demonstrate that the solubility if a substance is not constant.

3: Objectives | Demonstrate how the solubility of a salt varies with temperature Plot the solubility curve of a salt on the basis of observed data

4: Procedure | 1. The materials were prepared. 2. The test tubes were labeled. 3. We obtained 4.00g of ammonium chloride and was added to a test tube. The step was repeated for 4.50g, 5.00g, and 5.50g 4. 10.0ml of water was added to each test tube. 5. We set up a hot water bath, using a 250ml beaker. 6. The test tubes were placed into the hot water bath.

5: 7. Test the solubility versus temperature 8. The hot-water was boiled, the solutions were stirred. The solute in the test tubes was dissolved and the burner was turned off. 9. Using a test tube holder we removed test tube 5.5 from the water bath and placed it in a test tube rack. A thermometer was placed in the test tube and we allowed the solution to cool. 10.We checked the temperature at which crystallization occurred. The step was repeated with the rest of the solutions.

6: Results | 1. Temperature for the first crystallization of the 5.50g sample------74.3C 2. Temperature for the second crystallization of the 5.50g sample----- 63.4C 3. Temperature for the first crystallization of the 5.00g sample----68.9C 4. Temperature for the second crystallization of the 5.00g sample----63.2C 5. Temperature for the first crystallization of the 4.50g sample------64.3

7: 6. Temperature for the second crystallization of the 4.50g sample.------56.4C 7. Temperature for the first crystallization of the 4.00g sample-----57.6C 8. Temperature for the second crystallization of the 4.00g sample.------21.1C

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