flinnsci.com CHEMICALS SAVE ON HAZMAT FEES 51
Chlorine Water
saturated C0055 500 mL $11.80
(Packaged in PVC-coated bottles)
HAZARD ALERT: Toxic by ingestion or inhalation; strong, pungent odor;
avoid contact with organic materials and powdered metals. TLV 1.5 mg/m3 as
elemental chlorine.
Storage: Inorganic #2
Disposal: Allow the chlorine water to stand in an open container
under a
hood in a well-ventilated, protected area. The chlorine will slowly leave the
water and the container. The remaining water (now effectively de-gassed)
can be put down the drain.
Shelf Life: Whether you buy ready-made chlorine water or make your own
(see recipes below) the shelf life of our product or yours would be poor—
perhaps six months at best.
Color and Odor: Pale yellow liquid with a pungent odor like a swimming
pool.
CAS No. for chlorine gas is 7782-50-5
Safety Purchase Suggestion: Prepare this solution as you need it rather
than buy it.
Chloroform
reagent
CHCl3
F.W. 119.38
C0056 500 mL $21.80
HAZARD ALERT: Possible carcinogen. Prolonged inhalation may be
fatal; toxic and narcotic by inhalation; ingestion may be fatal. Store in a Flinn
Saf-Stor™ Can. Possible reproductive/fertility hazard. LD50 695 mg/kg. TLV 49
mg/m3.
Storage: Organic #4
Disposal: #27j
Shelf Life: Good if stored properly; keep from sources of light.
Soluble: Slightly in water; miscible with alcohol, ether, benzene, carbon
disulfide, carbon tetrachloride.
Color and Odor: Clear liquid with a sweet anesthesia odor.
CAS No. 67-66-3
Incompatibility: Oxidizing agents, alkalis and alkali metals.
Chromatography Solvent
for paper and plant chromatography
contains 20% acetone and 80% petroleum ether
C0422 500 mL $16.85
HAZARD ALERT: Mildly toxic by ingestion, inhalation and skin absorption.
Irritating to body tissues.
Storage: Organic #4
Disposal: #18b
Shelf Life: Good
Color and Odor: Colorless liquid with natural gas-like odor.
Chromium
laboratory grade, chunk
Cr
A.W. 52.0
C0058 100 g $23.05
HAZARD ALERT: Highly toxic as dust or fumes. TLV 0.5 mg/m3 as dust or
fume.
Storage: Inorganic #1
Disposal: #27f
Shelf Life: Indefinite
Soluble: Acids (except nitric); strong alkalis; insoluble in water.
Color and Odor: Gray, odorless solid.
CAS No. 7440-47-3
Chromium Nitrate
chromium(III) nitrate
reagent, crystal
Cr(NO3)3•9H2O
F.W. 400.18
C0061 100 g $17.10
HAZARD ALERT: Strong oxidizer; avoid contact with organic materials;
slightly toxic by ingestion. LD50 3250 mg/kg.
Storage: Inorganic #3
Disposal: #27f
Shelf Life: Good.
Soluble: Water and alcohol.
Color and Odor: Metallic gray/black, odorless solid.
CAS No. 7789-02-8
Chymosin
natural enzyme coagulant
for cheese-making
powder C0419 5 g $12.55
Storage: Miscellaneous, nonhazardous organic material.
Disposal: #26a
Shelf Life: Good if stored properly. Store in a cool (<10 °C) and dry place in
a closed container.
Soluble: Water
Color and Odor: Buff solid with malty odor.
Technical Note: Used for cheese-making demonstrations and experiments.
Prepare solutions fresh: dissolve 0.3 g chymosin in 100 mL of bottled water.
Use two drops of solution per 10-mL sample size of milk. Optimum temperature
for enzyme activity is 40 ºC. Two grams of C0419 should be enough to coagulate
more than 100 L of milk!
trans–Cinnamic Acid
3-phenyl-2-propenoic acid,(E)
reagent
C9H8O2
F.W. 148.159
C0401 500 g $89.45
HAZARD ALERT: Causes skin and serious eye irritation. May cause respiratory
irritation.
Storage: Organic #1
Disposal: #26a
Prepare Saturated Chlorine Water Solution
There are three common methods for preparing saturated chlorine water solution.
Carry out all reactions and work with the chlorine water under a fume hood.
1. Very slowly bubble chlorine gas from a chlorine gas cylinder or lecture bottle into the
required quantity of distilled water. Perform this process only under a fume hood.
2. Set up a chlorine gas generator using common lab glassware, equipment and chemicals.
You will need a long-stem funnel and a delivery tube assembled into a two-hole stopper
that will fit into a 250-mL Erlenmeyer or flat bottom flask. Place approximately 10 grams
of manganese dioxide (MnO2) (Flinn Catalog numbers M0023, M0025) into the flask. Now
slowly add approximately 40 mL of hydrochloric acid (Flinn Catalog numbers H0031, H0004,
H0005, H0006) and warm very slightly. Bubble the gas that is produced into a flask containing
distilled water. This process should produce about one liter of chlorine water and must
be performed under a fume hood.
trans–CINNAMIC ACID continued on next page.
3. Mix 100 mL of commercial bleach (like Clorox®) with 25 mL of 6 M hydrochloric acid (Flinn
Catalog number H0033) and then dilute to one liter with distilled water. The solution will
have a characteristic yellow-green or light green color. Do not immediately cover the
container in which the solution is prepared as a great deal of chlorine is formed. Allow
the solution to stand for a short period until it is stable. If the bleach is very fresh, it may
take days before the solution stops bubbling. Only when the bubbling stops should you
cap the bottle or container. You can be sure such a solution is saturated. If, at some later
time, you are not sure it is still saturated, then either make fresh solution or add some
bleach to your old solution. The wise option would be to make a fresh solution.
Safety Suggestion: Prepare the option you select only under a fume hood. Package only in
glass containers with a cap that has a plastic cap liner.
Label the material as follows: Solution causes severe burns. Avoid contact with skin, eyes or
clothing. Avoid breathing vapors. Do not pipet by mouth. Wash areas of contact with copious
quantities of water.
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