7783-49-5 Usage
Chemical Properties
White powder. Soluble in hot acids; slightly soluble
in water; insoluble in alcohol.
Physical properties
Anhydrous zinc fluoride is a white hygroscopic solid; tetragonal needles; density 4.9 g/cm3; melts at 872°C; vaporizes at 1,500°C; vapor pressure 1 torr at 1,243°C and 5 torr at 1,328°C; practically insoluble in water, 5.2 mg/L; sparingly soluble in HCl, HNO3 and ammonia solutionThe hydrated salt, ZnF2?4H2O, is a white crystalline solid; rhombohedral crystals; density 2.30 g/cm3; loses water of crystallization at 100°C; sparinglysoluble in water, about 1.52 g/100mL at 20°C.
Uses
Different sources of media describe the Uses of 7783-49-5 differently. You can refer to the following data:
1. Zinc Difluoride inhibits the erosion of enamel in vitro. It also functions as a fluorinating agent, Lewis acid catalyst and as an additive for catalytic transformations.
2. Zinc fluoride is a white crystalline powder, used in the manufacture of phosphors for fluorescent lights. It also is used in electroplating baths, in preservation of wood, in glazes and enamels for ceramics, and in fluorination reactions of organics.
Preparation
Zinc fluoride may be prepared by heating zinc hydroxide or zinc carbonate with hydrogen fluoride:
Zn(OH)2 + 2HF → ZnF2 + 2H2O
ZnCO3 + 2HF → ZnF2 + CO2 + H2O
Also, it can be precipitated by adding a solution of sodium fluoride to that of zinc acetate:
(CH3COO)2Zn + 2NaF → ZnF2 + 2CH3COONa
Hazard
Toxic material.
Flammability and Explosibility
Notclassified
Safety Profile
Poison by
subcutaneous route. Can react violently with
potassium. A fluorination agent. When
heated to decomposition it emits toxic
fumes of F and ZnO. See also
FLUORIDES and ZINC COMPOUNDS.
Purification Methods
A possible impurity is H2O which can be removed by heating at 100o or by heating to 800o in a dry atmosphere. Heating in the presence of NH4F produces larger crystals. It is sparingly soluble in H2O (1.51g/100mL) but more soluble in HCl, HNO3 and NH4OH. It can be stored in glass bottles. [Kwasnik in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 242 1963.]
References
[1] http://www.npi.gov.au/resource/zinc-and-compounds
[2] https://hazmap.nlm.nih.gov/category-details?id=7782&table=copytblagents
[3] Patent EP 0001677 A1: Flux for soft soldering of aluminum, a fluxed solder composition containing said flux and a method of soft soldering aluminum using said flux
Check Digit Verification of cas no
The CAS Registry Mumber 7783-49-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 3 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 7783-49:
(6*7)+(5*7)+(4*8)+(3*3)+(2*4)+(1*9)=135
135 % 10 = 5
So 7783-49-5 is a valid CAS Registry Number.
InChI:InChI=1/2FH.Zn/h2*1H;/q;;+2/p-2
