Potassium stannate

Potassium staimate, K2Sn(OH) (mol wt 298.93), and sodium stannate [12058-66-17, Na2Sn(OH), mol wt 266.71, are colorless crystals and are soluble in water. The solubiUty of potassium stannate in water is 110.5 g/100 mL water at 15°C and that of sodium stannate is 61.5 g/100 mL water at 15°C. The solubihty of sodium stannate decreases with increasing temperature, whereas the solubiUty of potassium stannate increases with increasing temperature. The solubihty of either sodium or potassium stannate decreases as the concentration of the respective free caustic increases. Hydrolysis of stannates yields hydrated stannic oxides and is the basis of the Tin Sol solution, which is used to replenish tin in stannate tin-plating baths (28,29). 

A typical bath is based on stannate and cyanide for 80% tin, the solution is made usiag 120 g/L potassium stannate, 11.3 g/L 2iac cyanide, and 30 g/L potassium cyanide. The bath is operated at 65°C with cathode current of 100—800 A/m and anode current of 150—250 A/m. Anodes are the same composition as the alloy, and have to be filmed properly as for stannate fin plafing. 

If the applied current density is reduced when a tin anode has been made passive in alkaline solution with the formation of a brown him and evolution of oxygen, the surface him changes to one of yellow colour and dissolution of tin as stannite ions proceeds freely . This effect is exploited in the electrodeposition of tin from sodium or potassium stannate solutions. 

Potassium pemnanganate Potassium nitrite Potassium nitrate Potassium sulphite Potassium stannate IV Potassium sulphate Poptassium metabisulphite Potassium peroxodisulphate Potassium tellurate (IV) Potassium pyrophosphate... 

Sodium or potassium stannate is used in alkaline electrotinning baths. Heavy-metal stannates are important in the manufacture of capacitor bodies. 

Compounds Stannic oxide tin tetrachloride stannic chloride stannous chloride stannous sulfate sodium stannate potassium stannate... 

No systemic effects have been reported from industrial exposure. Some inorganic tin compounds can cause skin or eye irritation because of acid or alkaline reaction produced with water. Tin tetrachloride, stannous chloride, and stannous sulfate are strong acids sodium and potassium stannate are strong... 

Of the large volume of tin compounds reported in the literature, possibly only ca 100 are commercially important. The most commercially significant inorganic compounds include stannic chloride, stannic oxide, potassium stannate, sodium stannate, stannous chloride, stannous fluoride, stannous fluoroborate, stannous oxide, stannous pyrophosphate, stannous sulfate, stannous 2-ethylhexanoate, and stannous oxalate. Also important are organotins of the dimethyl tin, dibutyltin, tributyltin, dioctyltin, triphenyltin, and tricyclohexyltin families. 

Hydrated Stannic Oxide. Hydrated stannic oxide of variable water content is obtained by the hydrolysis of stannates. Acidification of a sodium stannate solution precipitates the hydrate as a flocculent white mass. The colloidal solution, which is obtained by washing the mass free of water-soluble ions and peptization with potassium hydroxide, is stable below 50°C and forms the basis for the patented Tin Sol process for replenishing tin in stannate tin-plating baths. A similar type of solution (Stannasol A and B) is prepared by the direct electrolysis of concentrated potassium stannate solutions (26). 

As the presence of salts and by-products is a factor of importance, we report here a clean preparation of potassium stannate reagents by the... 

Potassium Stannates Preparation by the Deprotonation of Stannanes with KH 111... 

Water and alcohol react quantitatively with potassium stannates, leading to the corresponding triaryl- or trialkylstannanes [Ph3SnH 95% yield, bp 165-168° (0.3 torr), mp 28° (/i-Bu)3SnH 90% yield, bp 68-74° (0.3 torr)]. Deuterolysis is well suited for determination of stannyl anion content. 

Ammonium Bromide Ammonium Bisulfide Ammonium Hydrosulfide Ammonium Fluoride Ammonium Chloride Sal Ammoniac Santoprene 101-55 Santoprene 101-64 Santoprene 101-73 Santoprene 201-55 Santoprene 203-50 Calcium Hydrosulfide Ammonium Sulfide Potash Potassium Stannate Cumaldehyde Diphenylamine Amyl Cinnamaldehyde Phenoxyacetic Acid Diethylhexyl Sebacate (2-) Bis(2-Ethylhexyl) Sebacate Dioctyl Sebacate Phenyl Acetate Phenoxyethanol (2-) Ethylene Glycol Phenyl Ether Arcel... 

Stannate of potassa K2Sn03.3H20 Potassium stannate. 

Dipotassium tin trioxide EINECS 236-255-9 Potassium stannate Potassium stannate(IV) Stannate (SnOa ), dipotassium. Textile dyeing and printing, alkaline tinplating bath, [trihydrate] d = 3.197 soluble in H2O (100 g/100 ml), insoluble in EtOH. Allchem Ind Blythe, Williams Ltd. Elf Atochem N. Am. M T Harshaw Nihon Kagaku Sangyo. 

The alkali stannates (for example, Na20 Sn02-3 H2O) derive from the anion Sn(OH)e , in which the 6-coordination shell of tin is filled. From the Sn-0 distances in sodium stannate, Na2Sn(OH)e, and in potassium stannate, K2Sn(OH) e, an average 0-0 distance in Sn(OH) e ions of 2.77 A. can be calculated. 

Potassium stannate trihydrate K3Sn03-3H30 12142-33-6 298.961 col cry 3.20 vs H,0 1 EtOH... 

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