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Understanding Solubility: The Effects of Temperature and Pressure on Oxygen in Water

This resource explores the solubility of oxygen in water, highlighting key relationships such as the impact of pressure and temperature. It explains that increased pressure leads to enhanced solubility of oxygen, while higher temperatures result in decreased solubility. The material addresses various scenarios, including the saturation of solutions, the mass of oxygen gas that can dissolve in water under different conditions, and the principle of "like dissolves like." Examples include solubility in polar versus non-polar solvents and common solutes used in experimental labs.

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Understanding Solubility: The Effects of Temperature and Pressure on Oxygen in Water

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  1. Water C 3 Flashcardspp. 58-65

  2. Use the charts on pg. 62 to answer some of these questions.

  3. At what pressure is the solubility of oxygen 8 mg in 1000 g of water?

  4. 1 atm

  5. State the relationship between pressure and the solubility of oxygen.

  6. As pressure increases, the oxygen becomes more soluble (more dissolves).

  7. What is the relationship between temperature and dissolved oxygen?

  8. As temperature increases the amount of dissolved oxygen decreases.

  9. If you have 8 mg of O2 at 20oC, in 1000g of H2O, is the solution saturated, unsaturated or supersaturated?

  10. unsaturated

  11. What mass of O2 gas will dissolve in 1000g of H2O at 20oC?

  12. 9 mg of O2

  13. In the Solvents lab, what solutes dissolved in hexane?

  14. Iodine, I2Propanol, C3H7OHNapthalene, C10H8

  15. Why does a soda lose its “fizz” as it warms up?

  16. The carbon dioxide gas is less soluble at higher temperatures.

  17. What mass of O2 gas can be dissolved in 850g of H2O at 4 atm?

  18. 4 atm = 32 mg32mg = __X__1000g 850gX = 27.2 mg O2

  19. What is the minimum amount of H2O needed to dissolve 2 mg of O2 gas at 10oC?

  20. At 10oC:11mg =__2__1000g XgX = 181.8g of H2O

  21. What does “like dissolves like” mean? Give an example.

  22. Polar substances dissolve in polar substances.Non-polar substances dissolve in non-polar.Ex:Napthelene (moth balls) dissolved in hexane because they are both non-polar.Water and oil don’t dissolve since the water is polar and oil is non-polar.

  23. In the Solvents lab what solutes dissolved in water?

  24. Urea- CO(NH2)2Ammonium Chloride- NH4ClSodium Chloride- NaClPropanol- C3H7OHCopper Sulfate- CuSO4

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