865-33-8

Name Potassium methoxide
CAS 865-33-8
EINECS(EC#) 212-736-1
Molecular Formula CH3KO
MDL Number MFCD00012416
Molecular Weight 70.13
MOL File 865-33-8.mol
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Chemical Properties

Appearance solid
Melting point  -20°C
Boiling point  84°C
density  0.95 g/mL at 20 °C
vapor pressure  0Pa at 25℃
refractive index  n20/D 1.37
Fp  7°C
storage temp.  Flammables area
solubility  Soluble in methanol and ethanol.
form  Liquid
pka 15.17[at 20 ℃]
color  Clear colorless
Specific Gravity 0.95
PH 12.8 (7g/l, H2O, 20℃)
Stability: Stable. Reacts violently with water. Moisture sensitive. Absorbs carbon dioxide from the air. Incompatible with acids, strong oxidizing agents, acid chlorides, acid anhydrides, alkali metals.
Water Solubility  may decompose
Hydrolytic Sensitivity 7: reacts slowly with moisture/water
Sensitive  Moisture Sensitive
BRN  3551544
Exposure limits ACGIH: TWA 200 ppm; STEL 250 ppm (Skin)
OSHA: TWA 200 ppm(260 mg/m3)
NIOSH: IDLH 6000 ppm; TWA 200 ppm(260 mg/m3); STEL 250 ppm(325 mg/m3)
InChI 1S/CH3O.K/c1-2;/h1H3;/q-1;+1
InChIKey BDAWXSQJJCIFIK-UHFFFAOYSA-N
SMILES [K+].C[O-]
CAS DataBase Reference 865-33-8(CAS DataBase Reference)
EPA Substance Registry System 865-33-8(EPA Substance)
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Safety Data

Symbol(GHS)  Flame (GHS02)Corrosion (GHS05)Skull and Crossbones (GHS06)Health Hazard (GHS08)
GHS02,GHS05,GHS06,GHS08
Signal word  Danger
Hazard statements  H225-H301+H311+H331-H314-H370
Precautionary statements  P210-P280-P301+P310+P330-P301+P330+P331-P303+P361+P353-P305+P351+P338+P310
Hazard Codes  F,T,C
Risk Statements 
R11:Highly Flammable.
R14:Reacts violently with water.
R34:Causes burns.
R67:Vapors may cause drowsiness and dizziness.
R65:Harmful: May cause lung damage if swallowed.
R63:Possible risk of harm to the unborn child.
R48/20:Harmful: danger of serious damage to health by prolonged exposure through inhalation .
R39/23/24/25:Toxic: danger of very serious irreversible effects through inhalation, in contact with skin and if swallowed .
R38:Irritating to the skin.
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed .
Safety Statements 
S8:Keep container dry .
S16:Keep away from sources of ignition-No smoking .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S43:In case of fire, use ... (indicate in the space the precise type of fire-fighting equipment. If water increases the risk add-Never use water) .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S62:If swallowed, do not induce vomiting: seek medical advice immediately and show this container or label .
S46:If swallowed, seek medical advice immediately and show this container or label .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S33:Take precautionary measures against static discharges .
S29:Do not empty into drains .
S25:Avoid contact with eyes .
RIDADR  UN 3274 3/PG 2
WGK Germany  1
F  3-10-23
Autoignition Temperature 30 - 50 °C
TSCA  Yes
REACH Registrations Active
HazardClass  4.2
PackingGroup  II
HS Code  29051900
Storage Class 4.2 - Pyrophoric and self-heating hazardous materials
Hazard Classifications Self-heat. 1
Skin Corr. 1B

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