LeChatelier lab - Le Chatelier's Principle February 27th...

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Le Chatelier’s Principle February 27th, 2008 Lab Section 2216 Chemistry 002 Yunyun Wu Rebecca Dermody
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Purpose : The purpose of this lab was to see the effects of Le Chatelier’s Principal on an acid/base reaction, a slightly soluble salt solution, and a complex ion equilibrium. From the experiment we could see Le Chatelier’s Principal applied directly to the reactions we worked with. Procedure: Part 1 1. Add about 75 mL of deionized water to a 150 mL beaker 2. Heat beaker on hot plate 3. Add 75 mL deionized water to 150 mL beaker and fill half way with ice 4. Label two test tubes “NaHSO 4 ” and “Na 2 SO 4 5. Add 5 mL of solution to respective tubes 6. Add 10 drops of NaHSO using Beral piper into wells A1, A2, and A3 7. Add 20 drops into wells A4 and A5 8. Add 1 drop Thymol Blue indicator solution to NaHSO 4 solution to wells A1-A5 9. Mix solution and record color 10. Add one drop of Na 2 SO 4 to well A1 11. Mix solution and compare color to A2 12. Continue to add drops of Na 2 SO 4 until color change and record observations 13. Add a crystal of NaHSO 4 to well A3 and stir mixture and record color change 14. Continue to add crystals until a color change is observed 15. Rinse Beral pipet twice with deionized water 16. Use Beral pipet to draw up solution in well A4 and place pipet in hot water bath 17. Use Beral pipet to draw up solution in well A5 and place pipet in ice- water bath 18. Swill both pipets and record any color change 19. Exchange pipets in the two baths and record any color change
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