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7758-16-9

Name Disodium pytophosphate
CAS 7758-16-9
EINECS(EC#) 231-835-0
Molecular Formula H2Na2O7P2
MDL Number MFCD00014246
Molecular Weight 221.94
MOL File 7758-16-9.mol

Chemical Properties

Appearance white powder
Melting point  decomposes 220℃ [MER06]
density  (hexahydrate) 1.86
vapor pressure  0Pa at 20℃
storage temp.  −70°C
solubility  H2O: 0.1 M at 20 °C, clear, colorless
form  white powder
color  White to Off-White
PH 3.5-4.5 (20℃, 0.1M in H2O, freshly prepared)
Stability: Stable.
Water Solubility  Fully miscible in water. Insoluble in alcohol and ammonia.
λmax λ: 260 nm Amax: 0.11
λ: 280 nm Amax: 0.09
Merck  13,8643
InChI InChI=1S/Na.H4O7P2.H/c;1-8(2,3)7-9(4,5)6;/h;(H2,1,2,3)(H2,4,5,6);
InChIKey IQTFITJCETVNCI-UHFFFAOYSA-N
SMILES O(P(O)(O)=O)P(O)(O)=O.[NaH]
LogP -3.420 (est)
Uses
Sodium Pyrophosphate is a leavening agent, preservative, sequestrant, and buffer which is mildly acidic with a ph of 4.1. It is moderately soluble in water, with a solubility of 15 g in 100 ml at 25°c. It is used in doughnuts and biscuits for its variable gas release rate during the mixing, bench action, and baking process. It is used in baking powder as a leavening agent. It is used in canned fish products to reduce the level of undesired struvite crystals (magnesium ammonium phosphate hexahydrate) by complexing the magnesium. It is used to sequester metals in processed potatoes. It is also termed sapp, sodium acid pyrophosphate, acid sodium pyrophosphate, disodium diphosphate, and disodium dihydrogen pyrophosphate.
CAS DataBase Reference 7758-16-9(CAS DataBase Reference)
EPA Substance Registry System 7758-16-9(EPA Substance)

Safety Data

Hazard Codes  Xi
Risk Statements 
Safety Statements 
S24/25:Avoid contact with skin and eyes .
WGK Germany  2
RTECS  UX6475000
TSCA  Yes
Safety Profile
Poison by intravenous route. Moderately toxic by ingestion and subcutaneous routes. An irritant to skin, eyes, and mucous membranes. When heated to decomposition it emits toxic fumes of POx, and Na2O.
Hazardous Substances Data 7758-16-9(Hazardous Substances Data)

Raw materials And Preparation Products

Hazard Information

Material Safety Data Sheet(MSDS)

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