16961-83-4
Product Name:
Hexafluorosilicic acid
Formula:
F6H2Si
Synonyms:
Hexafluorosilicic acid;Fluorosilicic acid;Hydrogen hexafluorosilicate;Adrenocorticotropic hormone fragment 1-39;Corticotropin A
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Fluorosilicic acid appears as a colorless fuming liquid with a penetrating pungent odor. Corrosive to metals and tissue. Both the fumes and very short contact with the liquid can cause severe and painful burns. Used in water fluoridation, in hardening cement and ceramics, as a wood preservative. |
|---|---|
| Color/Form | Transparent, colorless, fuming liquid |
| Odor | Sour, pungent |
| Boiling Point | 212 °F at 760 mmHg (water) approx. (USCG, 1999) |
| Melting Point | -4 °F (USCG, 1999) |
| Solubility | DECOMP AT MP; DELIQUESCENT; WHITE CRYSTALS; SOL IN ALKALI; SOL IN COLD AND HOT WATER /DIHYDRATE/ |
| Density | 1.3 at 77 °F (approx.) (USCG, 1999) - Denser than water; will sink |
| Stability/Shelf Life | Fumes in air /dihydrate/. |
| Decomposition | When heated to decomposition it emits toxic fumes of /fluorides/. |
| Corrosivity | Attacks glass and stoneware |
| Refractive Index | INDEX OF REFRACTION: 1.3465 AT 25 °C/D |
| Other Experimental Properties | When anhydrous dissociates almost instantly into SiF4 and HF; a 60-70% solution solidifies around 19 °C forming crystalline dihydrate; may be distilled without decomposition only as 13.3% aqueous solution; fairly strong acid; the more concentrated solutions (but not the anhydrous liquid) can be stored in glass, although some etching will take place around the surface; usually stored in iron containers. |
| Chemical Classes | Toxic Gases & Vapors -> Acids, Inorganic |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Corrosion Corrosives GHS05  Skull and Crossbones Acute Toxicity GHS06 |
| GHS Hazard Statements |
H302:Acute toxicity,oral H311:Acute toxicity,dermal H314:Skin corrosion/irritation |
| Precautionary Statement Codes |
P270:Do not eat, drink or smoke when using this product. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
COMPUTED DESCRIPTORS
| Molecular Weight | 144.091 g/mol |
|---|---|
| Hydrogen Bond Donor Count | 2 |
| Hydrogen Bond Acceptor Count | 7 |
| Rotatable Bond Count | 0 |
| Exact Mass | 143.98299557 g/mol |
| Monoisotopic Mass | 143.98299557 g/mol |
| Topological Polar Surface Area | 0 Ų |
| Heavy Atom Count | 7 |
| Formal Charge | 0 |
| Complexity | 62.7 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 3 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Fluorosilicic acid appears as a colorless fuming liquid with a penetrating pungent odor. Corrosive to metals and tissue. Both the fumes and very short contact with the liquid can cause severe and painful burns. Used in water fluoridation, in hardening cement and ceramics, as a wood preservative.