Sodium fluoride is an inorganic chemical compound with the chemical formula NaF. The compound is a white or colorless crystalline solid that dissolves easily in water.
Sodium fluoride is a mineral fluoride salt that is used in small amounts in municipal water fluoridation systems to prevent dental caries.
The positive point of this material is the production of its various forms, so that today, depending on the type of application, it can be prepared in the form of gels, tablets.
This substance is found naturally around us, is non-flammable and corrosive to aluminum.
Physical and chemical properties:
Sodium fluoride is a colorless crystalline solid. It is soluble in water. This product is soluble in water and insoluble in alcohol. If it is exposed to heat, it decomposes. Its decomposition produces two toxic substances, hydrogen fluoride, and sodium dioxide.
|IUPAC name||Sodium fluoride|
|Molar mass||41.988173 g/mol|
|Appearance||White to greenish solid|
|Melting Point||993 °C (1,819 °F; 1,266 K)|
|Boiling point||1,704 °C (3,099 °F; 1,977 K)|
|Soloubility in water||36.4 g/L (0 °C);|
40.4 g/L (20 °C);
50.5 g/L (100 °C)
|Soloubility||slightly soluble in HF, ammonia|
negligible in alcohol, acetone, SO2, dimethylformamide
|Color||White to greenish|
|Form||cubic or tetragonal crystals|
|Chemical Structure Depiction|
The structure of sodium fluoride:
Sodium fluoride is an inorganic chemical compound that, when dissolved in water, releases the positively charged sodium element ( Na+)and the negatively charged fluoride ( F− )element and crystallizes as a cubic structure.
Sodium fluoride production process:
-It can be produced by neutralizing hydrofluoric acid with alkalis such as sodium carbonate (Na2CO3) and liquid sodium (NaOH) under pH-controlled conditions.
HF + NaOH → NaF + H2O
-From solutions containing HF, sodium fluoride precipitates as sodium bifluoride (NaHF2):
HF + NaF ⇌ NaHF2
-The method of preparation of pure sodium fluoride includes crystallization and washing steps. In the crystallization stage, Na2CO3 is placed in the reactor and hydrofluoric acid is added during stirring. When no carbon dioxide escapes, our process has reached the terminal point. suction filtration is carried out such that crystals are obtained.
In the washing step, the crystal is washed twice to obtain pure sodium fluoride.
Applications and Uses of sodium fluoride:
-In general, fluoride can prevent bacterial damage to the teeth and prevent decay. Therefore, this element is used in toothpaste and other oral protection products. Toothpaste containing this product must have permitted levels of NaF. This value is something around 1000 to 1500ppm.
-Due to the properties of fluoride in tooth protection, it is used as the main composition of mouthwash.
– Because sodium fluoride is toxic, it is commonly used in pesticides, including fungicides, insecticides, and herbicides.
-Due to the effects of this substance in improving auditory nerve dysfunction and reducing the incidence of hearing loss in patients, it has been prescribed tablets containing this compound for these patients.
-The tablets of this product are also used to cure osteoporosis. Sodium fluoride increases bone density but does not reduce the risk of fractures.
Other applications include:
Used as a fluorescent agent in the synthesis of aromatic compounds.
In the production of plastic products, Teflon as well as Freon production.
This material is used in engraving on glass.
Removal of hydrogen fluoride from exhaust gases of various factories.
Safety information of sodium fluoride:
It is very corrosive and toxic and is quickly absorbed by the skin, and even inhaling the vapors of this substance can be dangerous for the body.
It also irritates the stomach and may cause nausea, diarrhea, and even death.
Ingestion may cause vomiting, abdominal pain, diarrhea, convulsions, collapse, thirst, disturbed vision.
This combination can cause pain in the legs and small fractures.
Its use in pregnant women and children under 6 years is dangerous due to its destructive effects on the nervous system.
Packing and storage:
Store in a cool, with proper ventilation, away from heat and direct sunlight.
Store in a tightly-closed container and Keep it away from strong acids.