（四硫化钾）

Description

(POTASSIUM TETRASULFIDE) · CAS 12136-49-1 · K2S. UNII 31R0R7HD0N. Melting Point: 912 °C; Melting Point: 840 °C.

Identification

CAS Registry Number	12136-49-1
PubChem CID	162263
Molecular formula	K2S
IUPAC name	dipotassium;sulfide
UNII (FDA)	31R0R7HD0N

Computed Descriptors

Molecular Weight	110.26
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	1
Rotatable Bond Count	0
Exact Mass	109.89948414
Monoisotopic Mass	109.89948414
Topological Polar Surface Area	1
Heavy Atom Count	3
Formal Charge	0
Complexity	0

Physical & Chemical Properties

Melting Point	912 °C
Melting Point	840 °C

Physical description & handling notes

• Potassium sulfide, anhydrous appears as a yellow-red to red crystalline mass or fused solid with an odor of rotten eggs.
• Potassium sulfide, hydrated, with not less than 30% water of crystallization appears as a red crystalline solid. Denser than water. Contact may severely irritate skin, eyes and mucous membranes. May be toxic by ingestion.
• White very hygroscopic solid; Discolored by air; [Merck Index] Red or yellow-red deliquescent solid; [Hawley] White to yellow powder with an odor of rotten eggs; [Strem MSDS]
• HYGROSCOPIC WHITE CRYSTALS WITH CHARACTERISTIC ODOUR. TURNS RED OR BROWN ON EXPOSURE TO AIR.
• WHITE CUBIC CRYSTALS OR FUSED PLATES
• RED OR YELLOW-RED CRYSTALLINE MASS OR FUSED SOLID

Regulatory Status

Regulatory & Food Contact	CIR / INCI: Depilatory

GHS Hazard Classification

Reported hazard statements	H314, H400, H251 (44.3%), H300, H318, H371, H301, H312

Documented Uses

• Used in photography (toner); [www.ci.tucson.az.us/arthazards/medium.html] Used as an analytical reagent, depilatory, and medicine; [Hawley]
• Photographic Processing [Category: Other]
• Applying metallic patinas [Category: Hobbies]
• Reagent in analytical chemistry, depilatory, medicine.
• Information on 1 consumer products that contain Potassium sulfide in the following categories is provided:
• BEST PREPD FROM THE ELEMENTS IN LIQUID AMMONIA: KLEMM ET AL, Z ANORG ALLGEM CHEM 241: 281 (1939); FEHER IN HANDBOOK OF PREPARATIVE INORG CHEM VOL 1, G BRAUER, ED (ACADEMIC PRESS, NEW YORK, 2ND ED, 1963) PP 360-361.

Synonyms

POTASSIUM SULFIDE; 1312-73-8; potassium sulphide; Dipotassium monosulfide; Potassium sulfide (2:1); POTASSIUM MONOSULPHIDE; DIPOTASSIUM MONOSULPHIDE; 31R0R7HD0N; POTASSIUM SULPHIDE (2:1); HEPAR SULFURIS; RefChem:57958; POTASSIUM SULFURET; Kali Sulf. Bath Essence; POTASSIUM SULFIDE (K2S4); POTASSIUM SULPHIDE, ANHYDROUS; POTASSIUM POLYSULFIDE (K2S4)

Frequently Asked Questions

What are the CAS number and molecular formula of (POTASSIUM TETRASULFIDE)?

CAS 12136-49-1; molecular formula K2S; molecular weight — g/mol.

What other names is (POTASSIUM TETRASULFIDE) known by?

POTASSIUM SULFIDE, 1312-73-8, potassium sulphide, Dipotassium monosulfide, Potassium sulfide (2:1), POTASSIUM MONOSULPHIDE.

What is the regulatory status of (POTASSIUM TETRASULFIDE)?

Documented regulatory listings: CIR / INCI: Depilatory.

Is (POTASSIUM TETRASULFIDE) classified as hazardous?

Hazard statements reported: H314, H400, H251, H300, H318.

What are the key physical properties of (POTASSIUM TETRASULFIDE)?

Melting Point: 912 °C; Melting Point: 840 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.