Fluorides, solubility

Fluorides Soluble in water Sparingly Insoluble in water ... 

Galvez, J.L., Dufour, J., Negro, C., and Lopez-Mateos, F. Determination of iron and chromium fluorides solubility for the treatment of wastes from stainless steel mill, Chem. Eng. J., doi 10.1016/j.cej 03.014, 2007. 

In the more difficult calcium fluoride solubility problem, ion pairing prevented us from reducing the equations to one unknown. Instead, [H+] and [F ] were both unknown. However, for a fixed value of [H+], we could use SOLVER to solve for [F . The correct pH is the one at which the charge balance is satisfied. 

Properties Soft, bulky, solid material (88% silica) composed of skeletons of small prehistoric aquatic plants related to algae (diatoms). They have intricate geometric forms. Available as light-colored blocks, bricks, powder, etc. True d 1.9-2.35, bulk density from 5 to 15 lb/cu ft. Insoluble in acids except hydrogen fluoride, soluble in strong alkalies. Absorbs 1.5 1 times its weight of water, has high oil absorption capacity. Poor conductor of sound, heat, and electricity. Noncombustible. 

Properties Colorless crystals or white powder odorless and tasteless. D 2.2-2.6 thermal conductivity about half that of glass, mp 1710C, bp 2230C, high dielectric constant, high heat and shock resistance. Insoluble in water and acids except hydrogen fluoride soluble in molten alkai when finely divided and amorphous. Combines chemically with most metallic oxides melts to a glass with lowest known coefficient of expansion (fused silica). Noncombustible. 

Barium is a member of the alkaline-earth group of elements in Group 2 (IIA) of the period table. Calcium [7440-70-2], Ca, strontium [7440-24-6], Sr, and barium form a closely allied series in which the chemical and physical properties of the elements and their compounds vary systematically with increasing size, the ionic and electropositive nature being greatest for barium (see Calcium and calcium alloys Calcium compounds Strontium and STRONTIUM COMPOUNDS). As size increases, hydration tendencies of the crystalline salts increase solubilities of sulfates, nitrates, chlorides, etc, decrease (except fluorides) solubilities of halides in ethanol decrease thermal stabilities of carbonates, nitrates, and peroxides increase and the rates of reaction of the metals with hydrogen increase. 

PHYSICAL PROPERTIES finely granulated, white or gray, porous siliceous rock particles range in size from less than 0.1pm to about 7pm appear rounded in the microscope, but the x-ray diftfaction pattern is that of quartz odorless, tasteless solid practically insoluble in water or mineral acids, except hydrogen fluoride, soluble in molten alkali when finely divided insoluble in organic solvents MP (1710°C, 3110°F) BP (2230°C, 4046°F) DN (2.6 g/cm ) SG (2.66) VD (NA) VP (0 mmHg approximately at 20°C). 

NMR and EXAFS Investigations of Lanthanum Fluoride Solubility in Molten LiF-ZrF4-LaF3 Mixture Application in Molten Salts Reactor... 

W.T. Ward, et al.. Rare earth and yttrium fluorides solubility relations in various molten NaE-ZrE4 and NaF-ZrF4-UF4 solvents, J. Chem. Eng. Date 5 (2) (1960) 137—142. 

---