Skip to Content
MilliporeSigma
All Photos(1)

Key Documents

View All Documentation

1.05107

Supelco

Potassium disulfate (Potassium pyrosulfate)

for analysis EMSURE® ACS

Synonym(s):

Potassium disulfate (Potassium pyrosulfate), Potassium pyrosulfate

Sign Into View Organizational & Contract Pricing
All Photos(1)

About This Item

Empirical Formula (Hill Notation):
K2O7S2
CAS Number:
7790-62-7
Molecular Weight:
254.32
MDL number:
MFCD00011385
UNSPSC Code:
12352302
EC Index Number:
232-216-8
NACRES:
NA.21

grade

ACS reagent

Quality Level

300

product line

EMSURE®

assay

97.5-100.0% (K2S2O7 basis, acidimetric)

form

solid

impurities

≤0.01% Insoluble and by ammoniumhydroxide precipitated matter
≤2.5% Water
37.5-38.6% Acidity (as H2SO4)

pH

0.8 (20 °C, 50 g/L in H2O)

mp

325 °C

bulk density

830 kg/m3

anion traces

chloride (Cl-): ≤0.0005%
phosphate (PO43-): ≤0.001%

cation traces

Al: ≤0.001%
As: ≤0.0005%
Ca: ≤0.002%
Fe: ≤0.0005%
Mg: ≤0.0005%
N: ≤0.002%
Na: ≤0.01%
heavy metals (as Pb): ≤0.001%

storage temp.

no temp limit

InChI

1S/2K.H2O7S2/c;;1-8(2,3)7-9(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2

InChI key

KAQHZJVQFBJKCK-UHFFFAOYSA-L

Linkage

Replaces: PX1581; PX1581-1; PX1581-3; PX1581-20; PX1581-5W; PX1581-5

Analysis Note

Assay (acidimetric, as K₂S₂O₇): 97.5 - 100.0 %
Acidity (as H₂SO₄): 37.5 - 38.6 %
Insoluble and by ammoniumhydroxide precipitated matter: ≤ 0.01 %
Chloride (Cl): ≤ 0.0005 %
Phosphate (PO₄): ≤ 0.001 %
Total nitrogen (N): ≤ 0.002 %
Heavy metals (as Pb): ≤ 0.001 %
Al (Aluminium): ≤ 0.001 %
As (Arsenic): ≤ 0.0005 %
Ca (Calcium): ≤ 0.002 %
Fe (Iron): ≤ 0.0005 %
Mg (Magnesium): ≤ 0.0005 %
Na (Sodium): ≤ 0.01 %
Water (H₂O): ≤ 2.5 %
Conforms ACS.

Legal Information

EMSURE is a registered trademark of Merck KGaA, Darmstadt, Germany

pictograms

Skull and crossbonesCorrosion
GHS06,GHS05

signalword

Danger

hcodes

H314,H331

Hazard Classifications

Acute Tox. 3 Inhalation - Eye Dam. 1 - Skin Corr. 1A

Storage Class

6.1B - Non-combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials

wgk_germany

WGK 3

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service