58 1-800-452-1261
Indigo Carmine
indicator and stain
pH 11.6 blue to 13.0 yellow
C16H8N2Na2O8S2
F.W. 466.37
I0022 10 g $14.78
HAZARD ALERT: Slightly toxic by ingestion; body tissue irritant. LD50
2000 mg/kg.
Storage: Organic #9
Disposal: #26a
Shelf Life: Indefinite
Soluble: Water and slightly in alcohol.
Color and Odor: Violet, odorless solid.
CAS No. 860-22-0
C.I. #73015
Technical Note: To make a 0.25% solution, add 0.25 g of indigo carmine
to 100 mL of 50% ethyl alcohol. Prepare fresh for use; solution does not store
well. Color of the solution fades on standing.
Indole-3-Acetic Acid
reagent grade
C8H6NCH2COOH
F.W. 175.19
I0002 5 g $45.90
Storage: Organic #1
Disposal: #24a
Shelf Life: Indefinite
Soluble: Alcohol and ether; insoluble in water and chloroform.
Color and Odor: Light pink, odorless solid.
CAS No. 87-51-4
Technical Note: Use a 1.0–8.0 mg/L solution as a plant growth hormone.
Indophenol, Sodium Salt
see Dichloroindophenol, Sodium Salt
Ink, Black
can be used for chromatography
water soluble I0028 2-oz.
bottle
$16.77
Storage: Miscellaneous nonhazardous organic material.
Soluble: Water
Color and Odor: Black, odorless.
Instant Light
see Chemical Demonstration Kits, page 238
Iodine
resublimed
I2
F.W. 253.81
Reagent I0006 25 g $21.50
crystals I0007 100 g 48.48
Laboratory grade I0060 100 g $41.00
granules
(All above sizes are packaged in wax-sealed,
PVC-coated bottles)
HAZARD ALERT: Toxic by ingestion or inhalation. Reacts violently with
reducing materials, sulfur, iron, alkali metals, metal powders and phosphorus.
Irritates the skin; corrosive to eyes and respiratory tract. TLV 1.0 mg/m3.
Storage: Inorganic #2
Disposal: #12a
Shelf Life: Fair; the substance sublimes. Reacts with and corrodes metal
shelves or metal containers. Store in a Flinn Chem-Saf ™ Bag.
Soluble: Many organic solvents; not water.
Color and Odor: Black/purple solid with unique, acrid odor.
CAS No. 7553-56-2
Technical Note: Iodine may be removed from clothing by washing the stain
with a 10% solution of sodium thiosulfate and then rinsing with water.
Iodine, Tincture
contains potassium iodide, iodine,
water and ethyl alcohol
I0009 100 mL $ 8.06
I0035 500 mL 23.65
(Both sizes packaged
in PVC-coated bottles)
HAZARD ALERT: Contains ethyl alcohol; toxic by ingestion and inhalation;
flammable liquid.
Storage: Inorganic #2, store as a flammable liquid.
Disposal: #12a
Shelf Life: Good, if stored safely.
Color and Odor: Brown/black liquid with iodine and alcohol odor.
Iodine Solution
iodine-iodide
0.1 Molar I0039 500 mL $18.76
0.05 Molar I0048 100 mL $ 9.81
I0023 500 mL 16.45
HAZARD ALERT: Irritating to eyes and skin.
Storage: Inorganic #2
Disposal: #12a
Shelf Life: Fair to poor; store away from heat and direct light.
Color and Odor: Brown/red liquid with iodine odor.
Iodine–Potassium Iodide Solution
test solution for starch
I0038 100 mL $ 7.09
I0027 500 mL 11.34
HAZARD ALERT: Irritating to eyes and skin.
Storage: Inorganic #2
Disposal: #12a
Shelf Life: Fair to poor; store away from heat and direct light.
Color and Odor: Amber liquid with slight iodine odor.
Technical Note: Turns purple in the presence of starch.
Iodine Solution, Gram
staining solution
iodine-iodide
G0036 100 mL $6.56
G0009 500 mL 11.99
For hazard alert, storage, disposal, etc.,
see Iodine–Potassium Iodide Solution, I0038.
Color and Odor: Brown liquid with iodine odor.
Iodine Solution, Lugol’s
Weigert’s, vital stain solution
iodine-iodide I0036 100 mL $ 6.98
I0010 500 mL 14.50
For hazard alert, storage, disposal, etc.,
see Iodine–Potassium Iodide Solution, I0038.
Color and Odor: Brown liquid with iodine odor.
Ion Exchange Resin
Ion Exchange Resin SBA I0034 500 g $188.24
strongly basic anion exchange resin, Dowex® 2-X8
20–50 mesh
Ion Exchange Resin SAC I0043 100 g $85.78
strongly acidic cation exchange resin, Dowex® 50X8
50–100 mesh
Storage: Miscellaneous organic.
Disposal: #26a
Shelf Life: Excellent
Color and Odor: Buff or brown, odorless solid.
Continued on next column.
Preparing an Iodine Solution?
Iodine crystals are not directly soluble in water, which is why most water-based
iodine solutions call for potassium iodide as an ingredient. Iodine is soluble in
potassium iodide solutions. As a general rule, start with approximately onefourth
of the final volume of water and add the required amount of potassium
iodide. Once the potassium iodide has dissolved, add the iodine crystals. Stir
until completely dissolved and bring the solution up to its final volume. Iodine
solutions should be prepared under a fume hood.
Iodine continued
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