The Benefits of Using Silver Fluoride

Silver fluoride is an inorganic substance with the chemical formula AgF, which is a white or yellow-brown solid at room temperature with a melting point of 435°C and turns black upon exposure to moist air. AgF can be prepared by the reaction of silver carbonate or silver oxide with hydrofluoric acid. It is a widely used fluorinated agent.

Physical and chemical characteristics of silver fluoride

CAS： 7775-41-9 / 11113-87-4

EINECS： 231-895-8

Chemical formula： AgF

Molecular weight： 126.867

Density： 5.852 g/mL at 25 °C(lit.)

Melting point： 435 °C

Boiling point： 19.5°C at 760 mmHg

Flash point： 1150°C

Solubility： 182 g/100 mL (15.5 °C)

Steam pressure： 922mmHg at 25°C

Storage conditions： Keep in dark place,Inert atmosphere,Room temperature Incompatible with strong oxidizing agents, strong acids, reducing agents. Light sensitive. Hygroscopic.

Appearance： orange to brown solid

Silver fluoride production

1. Put silver carbonate in a platinum dish and add 40% hydrofluoric acid to dissolve it completely. The solution was evaporated over a water bath, then transferred to a sand bath, stirred with a platinum spoon and evaporated until dry. The purity of the product is 92% ~ 95%(containing 5% ~ 8% Ag2O). The whole synthesis process should be protected from light.

2. Electrolysis of glacial acetic acid solution containing 7% potassium fluoride under the avoidance of direct light, with a silver plate or silver rod as the anode, and platinum wire as the Yin. Extremely. The current during electrolysis should be greater than 40 mA. The silver fluoride generated on the anode comes loose from the electrode and collects at the bottom of the electrolytic vessel. The product was filtered out, washed with glacial acetic acid and anhydrous benzene, and then placed in a vacuum dryer at room temperature to remove the benzene, with a yield of 99.5%. Using 20 volts and 120 mA current, 0.5 g of silver fluoride can be obtained in 60 minutes.

Silver fluoride storage method

1, dry protective gas under the disposal.

2. Keep the storage device sealed.

3. Store in a tight container in a cool, dry place.

Application of silver fluoride

Mainly used as fluorinated agent: BrF or IF addition of chlorine or bromide to fluoride, ene to bromine or iodine in the presence of silver fluoride.