Monosodium Phosphate

Monosodium Phosphate, Monobasic, is anhydrous or contains one or two molecules of water of hydration and is slightly hygroscopic. The anhydrous form occurs as a white, crystalline powder or granules. The hydrated forms occur as white or transparent crystals or granules. All forms are freely soluble in water, but are insoluble in alcohol. The pHof a 1:100 solution is between 4.1 and 4.7.

Disodium Phosphate

Disodium Phosphate, Dibasic, occurs as a white, crystalline powder or as granules. It may be anhydrous or contain twomolecules of water of hydration. The anhydrous form is hygroscopic. Both forms are freely soluble in water and insoluble in alcohol.

Trisodium Phosphate

Trisodium Phosphate, Tribasic, occurs as white crystals or granules or as a crystalline material. It may be anhydrous or contain 1 to 12 molecules of water of hydration. The formula for a crystalline material is approximately4(Na3PO4·12H2O)- NaOH. It is freely soluble in water, but is insoluble in alcohol. The pH of a 1:100 aqueous solution is between 11.5 and 12.5.

Trisodium Pyrophosphate

Trisodium Pyrophosphate is white powder or granular, easily soluble in water, water solution is neutral. Not soluble in alcohol. It occurs anhydrous or as a monohydrate. Heated to 170℃could be decomposed into Disodium Diphosphate and and Tetrasodium Pyrophosphate. Heated above 240℃could be decomposed into metaphosphates.

Tetrasodium Pyrophosphate

Tetrasodium Pyrophosphate occurs as colorless or white crystals or as a white, crystalline or granular powder. It is anhydrous or contains 10 molecules of water of hydration. The decahydrate effloresces slightly in dry air. It is soluble in water, but is insoluble in alcohol. The pH of a 1:100 aqueous solution is about 10.

Sodium Acid Pyrophosphate

Sodium Acid Pyrophosphate occurs as a white, crystalline powder or granules. It is soluble in water. The pH of a 1:100 aqueous solution is about 4. It may contain a suitable aluminum and/or calcium salt to control the rate of reaction in leavening systems.

Sodium Hexametaphosphate

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Sodium Trimetaphosphate

Sodium Trimetaphosphate occurs as white crystals or as a white, crystalline powder. It is a cyclic polyphosphate composed of three metaphosphate units. It is freely soluble in water. The pH of a 1:100 aqueous solution is about 6.0.

Sodium Tripolyphosphate

Sodium Tripolyphosphate occurs as white, slightly hygroscopic granules, or as a powder. It is anhydrous or contains six molecules of water of hydration. It is freely soluble in water, but insoluble in alcohol. The pH of a1:100 aqueous solution is about 9.5.

Sodium Aluminium Phosphate

Sodium Aluminium Phosphate, Acidic, occurs as a white powder. It is anhydrous or contains two or four molecules of water of hydration. It is insoluble in water, but is soluble in hydrochloric acid.