Page 16 - Fuel Cell Teacher Edition

2. Use a graduated cylinder to measure 200mL of 10. Shake the bottle, then crack the cap to allow any
distilled water and pour it into the 1L PET bottle. built up gasses to escape.

3. Use a funnel to slowly pour about half of the 11. Pour the remaining NaOH pellets into the 1L PET
NaOH pellets into the 1L PET bottle. bottle.

4. Cap the 1L PET bottle, shake to break up most of 12. Allow the 1L PET bottle to sit in the ice water
the clumped pellets at the bottom of the bottle, for 6 minutes. Shake the bottle at each two
then immerse in ice water. minute interval, allowing any built up gasses to
escape by cracking the cap after each time
5. Allow the 1L PET bottle to sit in the ice water for
2 minutes. you shake it.
13. Perform a final inspection to ensure that there
6. Shake the bottle, then crack the cap to allow any
built up gasses to escape. is no buildup of solid NaOH around the bottom
of the bottle. The solution must be clear. If the
7. Place the 1L PET bottle in the ice water again for solution appears to be cloudy or more than 5˚C
2 minutes. warmer than room temperature then repeat
8. Shake the bottle, then crack the cap to allow any step 12.
built up gasses to escape. 14. Remove the solution from the ice bath and wipe

9. Place the 1L PET bottle in the ice water again for down the bottle.
2 minutes.

Xvi TOTAL REDOX™ – FUEL CELLS TOTAL REDOX™ – FUEL CELLS 1