SODIUM PYROPHOSPHATE

Tetrasodium pyrophosphate, also called sodium pyrophosphate, tetrasodium phosphate or TSPP, is a colorless transparent crystalline chemical compound with the formula Na4P2O7.

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Detailed Description for SODIUM PYROPHOSPHATE

pyro' is the chemical prefix for oxo acid formed through the loss of one water molecule from two molecules of an ortho acid (dehydration of two molecules by heating).  Pyrosulphuric acid is an example ( 2H2SO4 - H2O = H2S2O7). Otho acid is the compound fully hydrated acid or of its salts. Orthophosphoric acid is an example (H3PO4 = P2O5.3H2O), in contrast to the less hydrated form, metaphosphoric acid (HPO3 = P2O5.H2O). Pyrophosphoric acid is the anhydride of phosphoric acid obtained from dehydration of phosphoric acid

Tetrasodium pyrophosphate, also called sodium pyrophosphate, tetrasodium phosphate or TSPP, is a colorless transparent crystalline chemical compound with the formula Na4P2O7.

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. Common foods containing tetrasodium 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.

 

In toothpaste and dental floss, tetrasodium pyrophosphate acts as a tartar control agent, serving to remove calcium and magnesium from saliva and thus preventing them from being deposited on teeth. Tetrasodium pyrophosphate is used in commercial dental rinses before brushing to aid in plaque reduction.

 

Tetrasodium pyrophosphate is sometimes used in household detergents to prevent similar deposition on clothing, but due to its phosphate content it causes eutrophication of water, promoting algae growth.

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

hygroscopic white crystals

MELTING POINT  
BOILING POINT  
SPECIFIC GRAVITY  
SOLUBILITY IN WATER

slowly hydrolysis to sodium orthophosphate. (insoluble in alcohol and ammine)

pH

10.0 - 10.5 (1% sol.)

VAPOR DENSITY  

AUTOIGNITION

 

NFPA RATINGS

Health: 1; Flammability: 0; Reactivity: 0

REFRACTIVE INDEX

 

FLASH POINT  
STABILITY Stable under ordinary conditions

 

APPLICATIONS

Water softener; metal cleaner; soap and detergent builder; sequestering agent; in electrodeposition of metals; enamelling improvement; tin plating; china-clay purification; dyeing; oil-drilling muds; synthetic rubber production; cleaning agents and detergents - high solubility, hardness stabilization, soil dispersion; toothpaste - prevention of tarter


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