Page 254 - Demo

Safety Reference
Flinn Method #22a, continued Procedure A: Water Dilution
1a
Wear chemical splash goggles, chemical-resistant gloves, and a lab coat or chemical-resistant apron.
1-800-452-1261
flinnsci.com
252
Procedure B: Reduction
1b
Perform this procedure in a fume hood. Wear chemical splash goggles, chemical-resistant gloves, and a lab coat or chemical-resistant apron.
2a
Hydrogen peroxide of any concentra- tion may be disposed of by pouring it into a large beaker containing at least a tenfold excess of water. Stir constantly.
3a
H2O2
H2O
2b
If you are dealing with solid sodium peroxide, carefully add a small amount of water and break up any lumps with a plastic stirring rod. Do not grind dry solid.
When the mixture is uniform, flush it down the drain with large amounts of extra water.
4a
If you are dealing with sodium peroxide, care- fully add a small amount of water and break up any lumps with a plastic stirring rod.
5a
3b
Slowly add the sodium peroxide into a large beaker containing 1 M sodium metabisulfite (100 mL per g Na2O2) and stir continuously.
4b
Using pH paper as a monitor, neutralize the solution with 3 M hydrochloric acid.
5b
Na2O2
1 M Na2S2O5
pH Paper
Pour the material
slowly with continu-
ous stirring into a
large beaker of water.
Oxygen gas will
evolve and the solu-
tion will become
strongly basic. The
final amount of
sodium peroxide in the water should be no more than 5%. (If you have more sodium peroxide than will fit into this concentration in your beaker, do the procedure again until all the material is disposed of.)
3M HCl
Na2O2
pH Paper
H2O
Flush the neutral solution down the drain with excess water.
6a
Using pH paper as a monitor, neutralize the solution with 3 M hydrochloric acid.
7a
3M HCl
Please...Read the Narratives
Important narratives precede these specific chemical disposal methods! Please read each narrative carefully! Do not use these procedures if you are not comfortable with the chemistry. Do not use these procedures without first consulting with your local government regulatory officials. These procedures may not be used in some jurisdictions. All procedures involve some hazards and risks. Once again...read the narratives that precede these specific chemical disposal methods.
Flush the neutral solution down the drain with excess water.