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LAB FACTORS AFFECTING THE RATE OF SOLUBILITY

LAB FACTORS AFFECTING THE RATE OF SOLUBILITY. Factors That Affect Solubility. Crushing Increases the amount of exposed surface (the surface area). Factors That Affect Solubility. 2. Stirring Speeds up the movement of the molecules. Factors That Affect Solubility. Increasing Temperature

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LAB FACTORS AFFECTING THE RATE OF SOLUBILITY

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  1. LABFACTORS AFFECTING THE RATE OF SOLUBILITY

  2. Factors That Affect Solubility • Crushing • Increases the amount of exposed surface (the surface area)

  3. Factors That Affect Solubility 2. Stirring • Speeds up the movement of the molecules

  4. Factors That Affect Solubility • Increasing Temperature • Also moves molecules faster and forces them farther apart

  5. Factors That Affect Solubility 4. Increasing Pressure • Increase in Pressure = Increase in Solubility • Specific to gases Like in a soda can—The closed can compress the gas inside and allows the carbonation to mix more readily with the soda. Once the can is opened, the pressure is decreased, the gas begins to escape, until eventually the soda becomes “flat” due to lack of carbonation remaining in the soda.

  6. LAB PROCEDURES • PURPOSE: • Use the materials at your table to design/carry out a simple experiment that will allow you to test one of three factors that affect solubility: temperature, amount of stirring, or particle size. • Try to think outside the box a little bit. • Unacceptable Problem: “How does an increase (decrease) in temperature affect the solubility rate of salt in water?” • WHY?—Because we already know the answer to that! • Hypothesize on specific water/salt amounts or temperatures, etc. and what the difference in their solubility rates might be…

  7. LAB WRITE-UP • Will be attached to Page 72 and is to include: • Problem—Written as a QUESTION. • Hypothesis— “If…, then…” statement • Independent variable is part of the “If” • Dependent variable is part of the “then” • Materials—List them • Procedure—Step by step, specific enough that someone else could repeat what you’ve done • Observations—In a data table, showing three trials • Analysis—List controls and variables and create a graph to display the data recorded in your table • Conclusion—Was your hypothesis supported? Why/why not? Summarize your findings in complete sentences—at least 5 sentences.

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