Page 92 - Demo

Chemicals
Propylene Glycol
see 1,2-Propanediol
Pyridine
 HAZARD ALERT: Flammable liquid (flash point 20 °C/68 °F); harm- ful to skin and eyes; avoid prolonged exposure; toxic by ingestion, inhalation, and skin absorption. LD50 891 mg/kg. TLV 16 mg/m3. Storage: Organic #2 in a dedicated flammables cabinet. If one is not available, store in a Flinn Saf-Stor TM Can.
Disposal: #5. U-Listed (U196); purchase small amounts for effec- tive inventory control.
Shelf Life: Good if stored safely.
Soluble: Water, alcohol, and other organic solvents.
Color and Odor: Colorless liquid with unique and entirely disagree- able odor.
CAS No. 110-86-1
Pyridinium Tribromide
 HAZARD ALERT: Corrosive solid; causes severe skin burns and serious eye damage. Possible lachrymator and respiratory tract irri- tant. Exists in equilibrium with bromine when dissolved in solution. Treat with caution and do not use with metals.
Storage: Inorganic #2
Disposal: #26c
Shelf Life: Fair; store in a cool, dry place.
Soluble: Ethyl alcohol and glacial acetic acid; slightly soluble in water.
Color and Odor: Yellow to deep yellow, red crystalline powder; odorless.
Technical Note: Solid is used as a safer or “green” alternative to elemental bromine for bromination reactions in organic chemistry labs. Treat with caution and handle with care, as the solid slowly releases bromine when dissolved in solution. Do not use with metal labware or equipment.
CAS No. 39416-48-3
Pyrogallol
 HAZARD ALERT: Toxic; readily absorbed through the skin; harmful to eyes and lungs. Stains skin. LD50 (mouse) 300 mg/kg.
Storage: Organic #8 in a Flinn Chem-Saf TM Bag inside a locked poisons cabinet.
Disposal: #18b
Shelf Life: Indefinite; crystals turn gray on exposure to light.
Continued on next column.
1-800-452-1261
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flinnsci.com
PYROGALLOL continued
Soluble: Water and alcohol.
Color and Odor: White, odorless solid. CAS No. 87-66-1
reagent grade
C5H5N F.W. 79.10
P0094
100 mL
$26.80
Quicklime
see Calcium Oxide
Quinine Sulfate
Q
laboratory grade, powder
(C20H24N2O2)2•H2SO4•2H2O
Q0019
5g
$54.10
F.W. 782.97
 HAZARD ALERT: Skin irritant; moderately toxic by ingestion. Storage: Organic #2
Disposal: #5
Shelf Life: Indefinite; light-sensitive.
Soluble: Slightly in water and many common organic solvents. Color and Odor: White, odorless solid.
CAS No. 6119-70-6
Technical Note: Not for human consumption or taste tests.
Quieting Solution
see Polyvinyl Alcohol, 10% or Methyl Cellulose, 3%
R
Rennin
rennet
cheese-making enzyme
Please see our chemical listing for chymosin on page 386.
Resazurin
Storage: Organic #9
Disposal: #26a
Shelf Life: Indefinite
Soluble: Slightly in water; soluble in dilute alkali. Color and Odor: Gray, odorless solid.
CAS No. 62758-13-8
Resazurin Solution
For storage, disposal, etc., see Resazurin, R0012.
Color: Blue/black
*Special, unique dropping bottle package called a Flinn E-Z DropTM.
Resin, Ion Exchange
see Ion Exchange Resin
Resorcinol
 HAZARD ALERT: Toxic; readily absorbed through skin; skin and eye irritant. LD50 301 mg/kg. TLV 45 mg/m3.
Storage: Organic #8
Disposal: #18b. U-Listed (U201); purchase small amounts for effec- tive inventory control.
Shelf Life: Indefinite
Soluble: Water and many organic solvents. Color and Odor: White solid with floral odor. CAS No. 108-46-3
pyridinium bromide perbromide, pyridine hydrobromide perbromide minimum 85% tribromide, crystralline
C6H5N-HBr-Br2 F.W. 319.82
P0288
25 g
$34.55
biological stain/indicator pH 3.8 orange to 6.5 violet
C12H6NO4Na F.W. 251.18
R0012
1g
$18.30
pyrogallic acid laboratory grade, crystal
1,2,3-C6H3(OH)3 F.W. 126.11
P0096
100 g
$43.40
1%, aqueous
R0013*
20 mL
$8.90
laboratory grade, crystal
1,3-(OH)2-C6H4 F.W. 110.11
R0015
25 g
$12.85
R0002
100 g
30.20
Lab Safety for Undergraduates
Safety in undergraduate laboratories is important! Did you know the American Chemical Society recently revised its requirements for bachelors degree programs to emphasize responsible disposal techniques, compliance with safety regulations, proper use of PPE to minimize exposure to hazards, the use of safety data sheets and safety reference materials and the ability to recognize chemical and physical hazards in the laboratory and react appropriately? Flinn Scientific is your best resource for safety across all levels of the undergraduate curriculum. Give us a call or send an email— Flinn is here to help as you integrate safety into your curriculum!