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7722-88-5

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Identification

Name
Tetrasodium pyrophosphate
CAS
7722-88-5
Synonyms
DECAHYDRATE TETRASODIUM PYROPHOSPHATE
DIPHOSPHORIC ACID TETRASODIUM SALT
DIPHOSPHORIC ACID, TETRASODIUM SALT, DECAHYDRATE
PYROPHOSPHATE INORGANIC
Pyrophosphoric acid,tetrasodiumsalt
SODIUM DIPHOSPHATE
SODIUM DIPHOSPHATE DECAHYDRATE
SODIUM DIPHOSPHATE TETRABASIC DECAHYDRATE
SODIUM PYROPHOSPHATE
SODIUM PYROPHOSPHATE, 10-HYDRATE
SODIUM PYROPHOSPHATE DECAHYDRATE
SODIUM PYROPHOSPHATE TETRABASIC DECAHYDRATE
SODIUM TETRAPYROPHOSPHATE
TETRA-SODIUM DIPHOSPHATE
TETRA-SODIUM DIPHOSPHATE-10-HYDRATE
TETRA-SODIUM DIPHOSPHATE DECAHYDRATE
TETRASODIUM PYROPHOSPHATE
TETRASODIUM PYROPHOSPHATE DECAHYDRATE
TSPP
TSPP DECAHYDRATE
EINECS(EC#)
231-767-1
Molecular Formula
Na4O7P2
MDL Number
MFCD00003513
Molecular Weight
265.9
MOL File
7722-88-5.mol

Chemical Properties

Appearance
white crystalline powder or colourless crystals
Melting point 
80 °C
mp 
80 °C
Boiling point 
93.8 °C
bp 
93.8 °C
density 
2.53 g/mL at 25 °C(lit.)

storage temp. 
Inert atmosphere,Room Temperature
solubility 
H2O: 0.1 M at 20 °C, clear, colorless

form 
Granular
color 
White
Specific Gravity
2.534
Odor
Odorless
Stability:
Stable. Incompatible with strong oxidizing agents.
PH Range
10.3
Water Solubility 
Soluble in water. Insoluble in ethyl alcohol.
Sensitive 
Hygroscopic
Merck 
14,9240
InChIKey
FQENQNTWSFEDLI-UHFFFAOYSA-J
Uses
Tetrasodium Pyrophosphate is a coagulant, emulsifier, and sequestrant that is mildly alkaline, with a ph of 10. it is moderately soluble in water, with a solubility of 0.8 g/100 ml at 25°c. it is used as a coagulant in noncooked instant puddings to provide thicken- ing. it functions in cheese to reduce the meltability and fat separa- tion. it is used as a dispersant in malted milk and chocolate drink powders. it prevents crystal formation in tuna. it is also termed sodium pyrophosphate, tetrasodium diphosphate, and tspp.
CAS DataBase Reference
7722-88-5(CAS DataBase Reference)
EPA Substance Registry System
7722-88-5(EPA Substance)

Safety Data

Hazard Codes 
Xi
Risk Statements 
R36/37/38:Irritating to eyes, respiratory system and skin .
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing .
WGK Germany 
3

RTECS 
UX7350000

TSCA 
Yes
HS Code 
28353990
Safety Profile
Poison by ingestion, intraperitoneal, intravenous, and subcutaneous routes. It is not a cholinesterase inhibitor. When heated to decomposition it emits toxic fumes of POx and Na2O.
Hazardous Substances Data
7722-88-5(Hazardous Substances Data)

Raw materials And Preparation Products

Hazard Information

General Description
Odorless, white powder or granules. Mp: 995°C. Density: 2.53 g cm-3. Solubility in water: 3.16 g/100 mL (cold water); 40.26 g/100 mL boiling water. Used as a wool de-fatting agent, in bleaching operations, as a food additive. The related substance TETRASODIUM PYROPHOSPHATE(7722-88-5) decahydrate (Na4P2O7 0H2O) occurs as colorless transparent crystals. Loses its water when heated to 93.8°C.
Reactivity Profile
TETRASODIUM PYROPHOSPHATE is basic. Reacts exothermically with acids. Incompatible with strong oxidizing agents. Decomposes in ethyl alcohol.
Hazard
Toxic by inhalation.
Description
Sodium pyrophosphate, also called Tetrasodium pyrophosphate or TSPP is used in the laboratory as a buffering agent. The compound has been shown to be useful in the preparation of an EDTA-sodium pyrophosphate extraction buffer for microcystin analysis of soil samples. Tetrasodium pyrophosphate is an odorless, white powder or granules. It is used in water softener, buffering agent, thickening agent, dispersing agent, wool de-fatting agent, metal cleaner, soap and synthetic detergent builder, general sequestering agent, in electrodeposition of metals. It also acts as a tartar control agent in toothpaste and dental floss. In addition, it is used as a chelating agent in antimicrobial studies. It is also used as a food additive in common foods such as chicken nuggets, crab meat and canned tuna.
Chemical Properties
Tetrasodium pyrophosphate is a white crystalline powder or colourless crystals with the formula Na4P2O7. It contains the pyrophosphate ion and sodium cation. Toxicity is approximately twice that of table salt when ingested orally. There is also a hydrated form, Na4P2O7.10H2O.
Tetrasodium pyrophosphate
Tetrasodium pyrophosphate is used as a buffering agent, an emulsifier, a dispersing agent, and a thickening agent, and is often used as a food additive. It is widely used as an emulsifying salt (ES) in process cheese. Common foods containing sodium pyrophosphate include chicken nuggets, marshmallows, pudding, crab meat, imitation crab, canned tuna, and soy-based meat alternatives and cat foods and cat treats where it is used as a palatability enhancer. It is the active ingredient in Bakewell, the substitute for baking powder's acid component marketed during shortages in World War II. It is also used in some common baking powders.
Preparation
Tetrasodium pyrophosphate is formed when pure disodium hydrogen orthophosphate is heated to 500℃ for 5 hours. The product will contain better than 98 per cent Na4P2O7. Crystalline masses large enough for optical measurements are produced by heating in platinum to above the melting point of the tetrasodium pyrophosphate, 800°, and cooling slowly. Higher temperatures or longer heating times do not change the tetrasodium pyrophosphate, as this is the final product in the dehydration of disodium hydrogen orthophosphate.
Health Hazard
Tetrasodium pyrophosphate (TSPP) is of low toxicity, but the dust may be irritating to the eyes, upper respiratory tract, and skin. Mild to moderate skin and eye irritation have occurred with acute exposure to the dust.

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