96 1-800-452-1261
Sodium Thiocyanate
laboratory grade, crystal
NaSCN
F.W. 81.08
S0113 100 g $16.00
HAZARD ALERT: Moderately toxic. LD50 764 mg/kg.
Storage: Inorganic #7
Disposal: #26a
Shelf Life: Hygroscopic and affected by light; store in a Flinn Chem-Saf ™
Bag.
Soluble: Water and alcohol.
Color and Odor: White, odorless solid.
CAS No. 540-72-7
Sodium Thiosulfate
hypo, pentahydrate
crystal
Na2S2O3•5H2O
F.W. 248.19
Reagent S0114 500 g $ 10.25
S0115 2 kg 40.55
Laboratory grade S0116 1 kg $12.30
HAZARD ALERT: Slightly toxic by ingestion; body tissue irritant. LD50
2000 mg/kg.
Storage: Inorganic #2
Disposal: #12b
Shelf Life: Deliquescent; store in a Flinn Chem-Saf ™ Bag.
Soluble: Water; not alcohol.
Color and Odor: White, odorless solid.
CAS No. 10102-17-7
Sodium Thiosulfate
anhydrous
reagent grade, granular
Na2S2O3
F.W. 158.11
S0322 100 g $ 8.52
S0117 500 g 16.60
HAZARD ALERT: Slightly toxic by ingestion; body tissue irritant.
Storage: Inorganic #2
Disposal: #12b
Shelf Life: Deliquescent; store in a Flinn Chem-Saf ™ Bag.
Soluble: Water; not alcohol.
Color and Odor: White, odorless solid.
CAS No. 7772-98-7
Sodium Thiosulfate Solution
0.1 Molar
(as Na2S2O3) S0150 500 mL $6.85
Storage: Inorganic #2
Disposal: #12b
Shelf Life: Indefinite
Color and Odor: Colorless, odorless liquid.
Stains
see individual listings, e.g., Crystal Violet, Methylene Blue, etc.
Stannic…Stannous…
see Tin(IV) and Tin(II)
Starch, Corn
laboratory grade, powder
S0124 500 g $10.50
S0282 2 kg 27.45
Storage: Organic miscellaneous
Disposal: #26a
Shelf Life: Indefinite if kept dry.
Soluble: Water
Color and Odor: White, odorless solid.
Starch, Potato
powder
ACS Reagent S0122 100 g $18.50
starch soluble
for iodometry
S0123 500 g 57.95
Laboratory grade S0125 500 g $14.90
Storage: Organic miscellaneous
Disposal: #26a
Shelf Life: Indefinite if kept dry.
Soluble: Water
Color and Odor: White, odorless solid.
Starch, Spray
S0302 20 oz. can $6.85
Storage: Miscellaneous nonhazardous organic material.
Shelf Life: Indefinite
Soluble: Water
Color and Odor: White, odorless spray.
Technical Note: Starch solution as an indicator for iodine can easily
be made using spray starch. Generously spray the starch into the desired
quantity of water and stir. Prepare as needed since starch solutions have a
poor shelf life.
Starch Solution
0.5%, aqueous S0151 500 mL $10.10
Storage: Miscellaneous nonhazardous organic material.
Disposal: #26b
Shelf Life: Poor; deteriorates over time depending on storage conditions.
Color and Odor: Colorless, odorless liquid.
Stearic Acid
octadecanoic acid
powder
CH3(CH2)16COOH
F.W. 284.49
Reagent S0336 500 g $17.40
Laboratory grade S0126 500 g $19.25
Storage: Organic #1
Disposal: #26a
Shelf Life: Indefinite
Soluble: Many organic solvents; not water.
Color and Odor: Off-white solid with faint wax odor.
CAS No. 57-11-4
Technical Note: Laboratory grade stearic acid is actually 50% stearic acid
and 45% palmitic acid; melting point is 55–56 °C. Reagent grade is >95%
stearic acid: melting point is 67–69 °C. The reagent grade is a better choice
for melting point labs.
Steel, Shot
S0127 500 g $9.20
Storage: Inorganic #1
Disposal: #26a
Shelf Life: Indefinite
Soluble: Insoluble in chemicals commonly found on school premises.
Color and Odor: Gray, odorless solid.
Technical Note: Steel shot are irregularly shaped steel pieces, not small,
evenly sized spheres.
Steel, Wool
size 00, 16 pads S0128 300 g $8.94
HAZARD ALERT: Steel wool is a flammable solid. Avoid contact with
flames and electricity. Steel wool may spontaneously ignite upon contact with
the leads on a typical dry-cell battery.
Storage: Inorganic #1
Disposal: #26a
Goggle Use
When is it appropriate to wear goggles? Science teachers often respond by
citing specific situations (e.g., when working with strong bases, when working
with acids, when working with biuret). A good general rule would be…
WORKING WITH CHEMICALS… ANY CHEMICALS… WEAR GOGGLES!
Wear chemical splash goggles whenever working with
chemicals, glassware or heat.
STEEL, WOOL continued on next page.
Starch, Corn continued
Continued on next column.
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