Chemistry lab 14 -prelab

Chemistry lab 14 -prelab - PreLab#14 Procedure 1. Work with...

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PreLab#14 Procedure 1. Work with a partner to prepare one reaction solution 2. Use a specific spectrophotometer to acquire all their measurements throughout the course of the experiment 3. Set the wavelength of the Novaspec or Genesys 20 spectrophotometer at 440 nm 4. Use a clean, dry cuvet with distilled water to "zero" the instrument 5. Remember to wash your hands thoroughly with soap and water after handling solutions that contain Cr(VI) and do not pour any solution containing chromium down the sink 6. Use a volumetric pipet to transfer 5 mL of 0.0196 M potassium dichromate, K2Cr2O7, solution into a clean, dry 125 mL Erlenmeyer flask 7. Add 50 mL of 3.9 M sulfuric acid, H2SO4, to the flask using a graduated cylinder 8. Swirl the flask well to thoroughly mix the solution 9. Fill a new clean, dry cuvet with the acidic dichromate solution 10. With a Kimwipe, wipe off the outside of the cuvet so that is clean and dry 11. Place it in the spectrophotometer 12. Record the absorbance of the acidic dichromate solution in your notebook as the
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This note was uploaded on 02/25/2012 for the course CHEM 2142 taught by Professor Roberts during the Fall '10 term at Texas State.

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Chemistry lab 14 -prelab - PreLab#14 Procedure 1. Work with...

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