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Exploring Density: Pre-Lab Homework and Procedures for Liquids and Rubber Stoppers

DESCRIPTION

This pre-lab guide focuses on the objectives and procedures to determine the density of an unknown liquid and rubber stoppers through various methods. Key definitions include mass (measured with an analytical balance) and volume (measured with graduated glassware). Procedures include the Graduated Cylinder Method and the Buret Method for liquids, and two methods for rubber stoppers: Displaced Volume and Displaced Mass. Proper recording techniques, temperature considerations, safety notes, and waste disposal instructions are crucial for a successful experiment.

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Exploring Density: Pre-Lab Homework and Procedures for Liquids and Rubber Stoppers

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Presentation Transcript

  1. Density Part I Due Today: Density Part 1 Pre-Lab Homework: 1. Density Part-2 Pre Lab

  2. Objective • Collect data to: • Determine the density of an unknown liquid • Determine the density of rubber stoppers

  3. Key Terms • Mass – determined by an analytical balance • Volume – determined by graduated glassware • RECORD THE TEMPERATURE OF WATER! • RECORD YOUR UNKNOWN

  4. Procedure Notes • Density of an Unknown Solution 1. Graduated Cylinder Method 2. Buret Method

  5. Procedure Notes 1. Graduated Cylinder Method • Record the mass of the liquid on the balance • Record the volume REMAINING in the graduated cylinder • Measure from the bottom of the meniscus • Measure to the nearest 0.1 mL

  6. Procedure Notes 2. Buret Method • Record the mass of the liquid in the beaker • Record the volume DISPENSED from the buret • Measure from the bottom of the meniscus • Measure to the nearest 0.01 mL • DO NOT record the volume remaining in the buret

  7. Procedure Notes • Density of Rubber 3. Displaced Volume Method 4. Displaced Mass Method

  8. Procedure Notes 1. Displaced Volume Method • Record the mass of each stopper • Record the volume displaced when the stoppers are added • Measure to the nearest 0.1 mL

  9. Procedure Notes 2. Displaced Mass Method • Fill the flask entirely • Make sure there are NO air bubbles • Record the flask without the rubber stopper • Make sure the glass stopper is on the flask • Record the flask with the rubber stoppers • Dry off the flask before placing it on the balance

  10. Waste • Blue and Yellow liquid  Down the drain • Green liquid  Waste container in hood

  11. Risk Assessment • Green Solution: • Isopropyl Alcohol • Danger • Flammable Liquid • Mild Skin Irritation • Harmful if Swallowed

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