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SODIUM HYDROXIDE SOLUTION continued Disposal: #10
Shelf Life: Good if kept tightly closed. Color and Odor: Colorless, odorless liquid.
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Sodium Hydroxide and Heat
Preparing Sodium Hydroxide Solution?
A large amount of heat is released when sodium hydroxide dissolves in water. The temperature of the solution may increase very rapidly. In fact, the temperature may rise so fast that the solution will boil and possibly spatter a hot, caustic solution. Immerse the beaker or flask in an ice water bath to control the solution temperature. Add ingredients slowly while stirring continuously. Use only borosilicate glassware, and make sure that there are no scratches, chips or breaks.
Sodium Hydroxide
Water
Ice and Water
granular NaI
F.W. 149.92
Reagent
S0083
25 g
$ 13.65
S0084
100 g
34.90
S0085
500 g
147.95
Laboratory grade
S0436
100 g
$ 31.50
S0437
500 g
131.70
(as Nal)
0.5 Molar
S0369
500 mL
$23.25
0.1 Molar
S0245
500 mL
8.90
Sodium Hydroxide Solution
For hazard alert, storage, disposal, etc., see Sodium Hydroxide Solution, S0217.
Sodium Hypochlorite Solution
 HAZARD ALERT: Corrosive liquid; causes skin burns; reacts with acid to evolve chlorine gas; evolves chlorine when heated; moder- ately toxic by ingestion and inhalation; avoid contact with organic material.
Storage: Inorganic #6
Disposal: #26b
Shelf Life: Fair; decomposes upon exposure to heat or light. Store in a cool, dry place.
Color and Odor: Faint yellow liquid; odor like chlorine or bleach. CAS No. 7681-52-9 (for pure NaOCl)
Technical Note: Flinn sodium hypochlorite solution contains 5–51⁄2% w/v sodium hypochlorite. Solution is approximately 0.7 M.
Sodium Hyposulfite
see Sodium Thiosulfate
SODIUM IODATE continued
 HAZARD ALERT: Oxidant; fire risk in contact with organic mate- rial; slightly toxic by ingestion.
Storage: Inorganic #6
Disposal: #12a
Shelf Life: Deliquescent; changes color on exposure to light; keep tightly closed; store in a Flinn Chem-Saf TM Bag.
Soluble: Water and acetone; not alcohol.
Color and Odor: White solid with faint iodine odor.
CAS No. 7681-55-2
Sodium Iodide
 HAZARD ALERT: Slightly toxic. LD50 4340 mg/kg.
Storage: Inorganic #2
Disposal: #26a
Shelf Life: Deliquescent; changes color on exposure to light; keep tightly closed; store in a Flinn Chem-Saf TM Bag.
Soluble: Water, alcohol, and glycerin. Color and Odor: White, odorless solid. CAS No. 7681-82-5
Sodium Iodide Solution
Storage: Inorganic #2
Disposal: #26b
Shelf Life: Good, if kept tightly closed. Color and Odor: Colorless, odorless liquid.
Sodium Lauryl Sulfate
see Dodecyl Sulfate, Sodium Salt
Sodium Metabisulfite
 HAZARD ALERT: Skin and tissue irritant; moderately toxic by ingestion. LD50 1131 mg/kg.
Storage: Inorganic #2
Disposal: #12b
Shelf Life: Poor; moisture-sensitive.
Soluble: Water; slightly in alcohol.
Color and Odor: White solid with a sulfur odor. CAS No. 7681-57-4
(as NaOH)
6 Molar
S0242
500 mL
$10.25
3 Molar
S0447
500 mL
8.75
1 Molar
S0148
500 mL
6.80
0.5 Molar
S0243
500 mL
6.90
0.2 Molar
S0244
500 mL
6.70
0.1 Molar
S0149
500 mL
5.80
sodium pyrosulfite reagent grade, granular
Na2S2O5 F.W. 190.11
S0317
100 g
$ 7.20
S0087
500 g
15.70
bleach, 5% available chlorine
NaOCl F.W. 74.44
S0079
475 mL
$ 6.65
S0080
1 liter
10.75
S0081
3.78 liters
18.25
Alkalis and Eyes
The most common alkalis on school premises are sodium hydrox- ide and potassium hydroxide. Even weak solutions react with (attack) body fat and skin. The skin feels soapy, but there is no sensation of burning. The underlying nerves are destroyed or altered so that no sensation of pain occurs. Alkalis are more subtly dangerous to the eyes than acids in this regard. A victim will simply not realize the damage done. When you see the warning “strong alkali,” the goggles go on.
Sodium Iodate
laboratory grade, powder
NaIO3
F.W. 197.90
S0218
25 g
$14.05
S0082
100 g
37.25
Continued on next column.