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Lead Iodide Precipitate Lab Report

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Introduction

Chad Brelsford Lead Iodide Precipitate Lab Report Introduction Problem: What mole ratio of lead chloride and sodium iodide results in then greatest amount of lead iodide as a precipitate? Hypothesis: If I mix 2 ml of lead chloride and 3 ml of sodium iodide, then I will get the greatest amount of precipitate. Variables: * Independent: amount of PbCl2, amount of NaI * Dependent: amount of Lead Iodide formed * Constants: amount of water, resting position of the cuvettes, Temperature, concentration of the PbCl2 solution, concentration of the NaI solution Procedures Materials: 12 empty cuvettes, a cuvette holder, a ruler with mm measurements, 2-10ml graduated cylinders, 0.35 solution PbCl2, 0.35 solution NaI Procedures: 1. ...read more.

Middle

5. Place all 12 cuvettes in a cuvette holder, allowing them to be sitting at an upright position (completely vertical and perpendicular to the desk). 6. Allow the precipitate to settle completely to the bottom of the cuvettes. 7. Once the precipitate has settled, measure the height from the bottom of the cuvette to the top of the precipitate in millimeters and record your results in Data Table A. Data Table: Data Table A Group Height of precipitate (mm) Trial #1 Trial #2 Trial #3 Average Height of Precipitate (mm) A Not measurable Not measurable Not measurable Not measurable B 2.0mm 3.0mm 3.0mm 2.67mm C 4.0mm 5.0mm 5.0mm 4.67mm D 4.0mm 4.0mm 5.0mm 4.33mm Constants and Givens: amount of solution, resting position of the cuvettes, Temperature, concentration of the PbCl2 solution, concentration of the NaI solution. ...read more.

Conclusion

Error Propagation: The cuvettes might not have been stored completely upright, and thus would have made the measurement of the precipitate inaccurate. There was no standard way to measure the amount of precipitate in the cuvettes, and thus would have made the measurements erroneous. Conclusion Conclusion: My hypothesis was correct because the greatest amount of precipitate formed when the amount of lead chloride was 2 mL and the amount of sodium iodide was 3 mL. Evaluation of Procedures: Improvements: The cuvettes might not have been stored completely upright, but that was due to a lack of proper equipment, and this error could have been eliminated by an improvement of equipment. There was no standard way to measure the amount of precipitate in the cuvettes, and marking all of the cuvettes at standard intervals could have eliminated this error. ...read more.

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