potassium metabisulphite 95% extrapure

Six white plastic bottles with red caps of varying sizes are lined up in ascending order against a plain gray background.

Three chemical solution bottles with red caps are arranged side by side against a gray background. The labels read "Methyl Orange Indicator Solution" and "Fehling's Solution No. A.

Three white chemical bottles with red caps, labeled "Chemnovyo," arranged in order of size against a plain gray background.

Four plastic bottles of chemical reagents with red caps, labeled for different substances, are arranged in size order against a gray background.

Five black plastic chemical bottles of various sizes are arranged on a gray surface against a dark gray background. Labels are visible but not fully legible.

Six brown pharmaceutical containers of varying sizes with white and red ChemBooz labels are arranged in a row against a plain gray background.

Three black plastic bottles of nitric acid with white hazard labels are arranged in a row against a grey background.

Two brown glass bottles with red caps, labeled as chemical containers, are placed side by side on a gray surface with a dark background.

Two white plastic chemical containers with black lids, labeled "Chemnovato." The left contains Magnesium Sulphate, and the right contains Acetyl Salicylic Acid, both on a gray background.

Three chemical bottles labeled Toluene, Iso-Propyl Alcohol, and Chloroform are arranged side by side on a gray background.

Six brown glass bottles of varying sizes with white labels and black or white caps, containing Trichloroacetic Acid 99% AR from Chemoxy, are arranged in a row on a gray background.

Two brown glass bottles labeled "Chloroform 99.8% for HPLC" with hazard symbols, placed side by side on a neutral gray background.

Three dark brown bottles with red caps and Chemnovatic labels contain hydrochloric acid, nitric acid, and sulfuric acid, arranged side by side on a gray background.

Specification

Description

Potassium pyrosulfite; Dipotassium disulfite

CAS	16731-55-8
Molecular Formula	K2S2O5
Molecular Weight	222.31
Shelf Life	60 Months

Physical Properties
Physical State at 20 °C	Solid	Colour	White crystalline
Odour	Odorless	pH Value	3-4.5 at 22.2 g/l at 25 °C
Melting Point/ Freezing Point [°C]	150°C	Decomposition Point [°C]	150°C
Vapour Density	2.3	Density [g/cm3]	2.34
Solubility in Water [% weight]	22.2 g/l at 20 °C

Specifications
Appearance	White crystalline powder	Assay (Iodometric)	95 – 99.9%
Iodometric,So2	54.8 – 57.6%	Appearance of Solution	Passes test
pH (5% Solution in Water)	3 – 4.5	Chloride (Cl)	Max 0.05%
Heavy Metal (As Pb)	Max 0.001%	Thiosulphate	Passes test
Copper (Cu)	Max 0.0025%	Zinc (Zn)	Max 0.0025%
Iron (Fe)	Max 0.002%	Selenium (Se)	Max 0.0005%
Arsenic (As)	Max 0.0002%	Mercury (Hg)	Max 0.0001%

Dangerous Goods Information
UN Number	–	DG Class	–

Safety Information & Hazard Symbols
Symbol	GHS07
Signal Word	Warning
Hazard Statement	H315-H319-H335
Precaution Statement	P261-P305 + P351 + P338

potassium metabisulphite 95% extrapure

Price range: $41.25 through $384.95

Size

UOM

Clear

SKU C02138-00500-HS Category Chemicals