Potassium pyrosulfate

Synonym(s):Potassium disulfate (Potassium pyrosulfate);Potassium pyrosulfate

Colorless needles or white, crystalline powder or fused pieces. Soluble in water ( converted to potassium bisulfate).

Acid flux in analysis, laboratory reagent.

Potassium disulfate (K₂S₂O₇) can be used:

As a salt catalyst for the conversion of hemicellulose into reducing sugars such as xylose and galactose by mechanocatalysis .
In the preparation of diacylbenzenes via Pd-catalyzed decarboxylative acylation of aromatic ketones with oxocarboxylic acids.
As an oxidant for the preparation of monosubstituted triazoles from aryl azides and propargyl alcohol using Ag₂O as a catalyst.

Potassium disulfite supported on silica may be used for the synthesis of ethyl pyruvate.

Potassium disulfite (Potassium pyrosulfate) has been synthesized from potassium hydrogen sulfate, via melting.

Non flammable

Melting point:	325 °C
Density	2.28 g/mL at 25 °C (lit.)
storage temp.	no restrictions.
solubility	H₂O: 0.1 M at 20 °C, clear, colorless
form	Solid
color	White
Specific Gravity	2.28
PH Range	1 - 2 at 25.5 g/l at 25 °C
PH	0.8 (50g/l, H2O, 20℃)
Odor	Odorless
Water Solubility	MAY DECOMPOSE
Sensitive	Hygroscopic
Merck	14,7664
Stability:	Stable. Incompatible with strong acids, strong bases.
CAS DataBase Reference	7790-62-7(CAS DataBase Reference)
EPA Substance Registry System	Disulfuric acid, dipotassium salt (7790-62-7)

Signal word	Danger
Pictogram(s)	Corrosion Corrosives GHS05 Skull and Crossbones Acute Toxicity GHS06
GHS Hazard Statements	H314:Skin corrosion/irritation H330:Acute toxicity,inhalation
Precautionary Statement Codes	P260:Do not breathe dust/fume/gas/mist/vapours/spray. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.