Potassium bisulfate

Potassium bisulfate (poe-TAS-ee-yum BYE-sul-fate) is an odorless white crystalline solid that begins to decompose at its melting point. It is deliquescent, meaning that has such a strong tendency to absorb moisture from the air that it becomes wet and dissolves in the water it has absorbed. 

Potassium bisulfate is typically made by heating potassium sulfate (K2S04) with sulfuric acid. The acid provides the hydrogen needed to convert the salt (K2S04) to the corresponding acid salt (KHS04). 

Potassium bisulfate is used as a food additive. The compound is listed on the U.S. Food and Drug Administration s 

Potassium bisulfate. Red atoms are oxygen white atom is hydrogen yellow atom is sulfur and turquoise atom is potassium. Gray sticks indicate double bonds, publishers 

Potassium bisulfate is a strong irritant to human tissue. If spilled on the skin, inhaled, or ingested, it can burn tissue causing skin rashes, sore nasal passages, irritation of the throat, and damage to the eyes. Burns of the mouth and stomach may also occur. These hazards are of concern primarily to people who work directly with the compound and do not pose a threat as a food additive. 

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But that is not the case. What the Korean lab found out was that when this procedure is performed, the OH stabilizes on the alpha carbon. That is the carbon right next to the phenyl ring. If one has any use for it as is then that is fine. But what is most preferable is to reduce the OH to get the propenylbenzene (say isoelemicin for our example). Using the simple potassium bisulfate reduction recipe, one can get rid of the OH with no problems at all. 

The oxidation of teUurium(IV) by permanganate as an analytical method has been studied in some detail (26). The sample is dissolved in 1 1 nitric-sulfuric acid mixture addition of potassium bisulfate and repeated fuming with sulfuric acid volatilises the selenium. The tellurite is dissolved in 10 vol % sulfuric acid, followed by threefold dilution with water and titration with potassium permanganate ... 

Then, 1-(3-acetylthio-2-methylpropanoyl)-L-proline is produced. The 1-(3-acetylthio-3-methyl-propanoyl)-L-proline tert-butyl ester (7.8 g) is dissolved in a mixture of anisole (55 ml) and trifluoroacetic acid (110 ml). After one hour storage at room temperature the solvent Is removed in vacuo and the residue is precipitated several times from ether-hexane. The residue (6.8 g) is dissolved in acetonitrile (40 ml) and dicyclohexylamine (4.5 ml) is added. The crystalline salt is boiled with fresh acetonitrile (100 ml), chilled to room temperature and filtered, yield 3 g, MP 187°C to 188°C. This material is recrystallized from isopropanol [ttlo -67° (C 1.4, EtOH). The crystalline dicyclohexylamine salt is suspended in a mixture of 5% aqueous potassium bisulfate and ethyl acetate. The organic phase is washed with water and concentrated to dryness. The residue is crystallized from ethyl acetate-hexane to yield the 1-(3-acetylthio-2-D-methylpropanoyl-L-proline, MP83°Cto 85°C. 

Cuprous cyanide Ethyl bromide Potassium bisulfate Sodium hydroxide... 

B) A solution of (SM) (330 mg) in trifluoroacetic acid (7 ml) was kept under nitrogen at room temperature for 15 minutes. Ether (100 ml) was added and the precipitate was filtered, washed thoroughly with ether and dried. This material (300 mg) was added in portions to concentrated sulfuric acid (18 ml) cooled at -20°C with vigorous stirring. After 15 minutes a solution of potassium bisulfate in concentrated sulfuric acid (408 mg in 3 ml) was added. The reaction mixture was stirred for 75 minutes at -15°Cand then stored at -7°Cfor 285 minutes. The sulfuric acid solution was poured into cold ether (400 ml) precipitate was filtered, washed with cold ether, and suspended in cold water. Complete solution was then achieved by careful addition of 2N sodium hydroxide. Acidification with N hydrochloric acid led to the precipitation of the desired octapeptide sulfate ester. Yield 200 mg. 

Zirconium powder mixed with an approximately equal quantity of 17% potassium bisulfate in concentrated sulfuric acid exploded violently. 

The salt, on treatment with sulfuric acid, yields potassium bisulfate and perchloric acid ... 

If the starting material is gadolinite, ore is digested with hydrochloric or nitric acid. Rare earths dissolve in acid. The solution is treated with sodium oxalate or oxalic acid to precipitate rare earths as oxalates. For euxenite, ore is opened either by fusion with potassium bisulfate or digestion with hydrofluoric acid. If monazite or xenotime is extracted, ore is either heated with sulfuric acid or digested with caustic soda solution at elevated temperatures. 

Only polyarylallenes can be made in fair yield by heating the corresponding alcohols with either acetic anhydride or potassium bisulfate since the hydroxyl group is relatively labile [32]. The competing side reaction is the formation of indenes and dimers [33-36] (Eq. 29). 

In the radiochemical procedure the irradiated coal sample and mercuric oxide carrier are digested with sulfuric acid, followed by nitric acid. Water and potassium bisulfate are added to drive off any nitric acid remaining. The mercury is separated by a standard dithizone extraction, and the extract is counted for the 0.077 MeV photopeak of 197Hg with the Nal detector. 

Niobium occurs, usually with tantalum, in columbite Fe(NbC>3)2, (80% Nb205). pyrochlore (50% Nb2C>5). samarskne (50% Nb2Oj). chiefly found in western Australia, and South Dakota. Recovered along with tantalum by fusion with potassium bisulfate, and obtained in the residue after subsequent extraction with II20. Niobium and tantalum are separated by fractional crystallization uf the potassium fluorides, niobium concentrating in the mother liquid and tantalum in the crystals. 

Pyruvic acid may be obtained by the distillation of tartaric acid or glyceric acid.7 Better results are obtained, however, by the distillation of tartaric acid in the presence of a dehydrating agent such as potassium bisulfate.8 This method has been adopted after a study of a variety of dehydrating agents and various experimental procedures. 

Sulfuric acid (l.ljf) was prepared by diluting 25 ml. of concentrated sulfuric acid with 398 ml. of water. The submitters used solid potassium bisulfate for acidification to pH 3.0. 

A mixture of 65 g crude 1 -(3,4-methylenedioxyphenyl)-2-butanol and 1 g finely powdered potassium bisulfate was heated with a soft flame until the internal temperature reached 170 °C and H,0 was no longer evolved. The entire reaction mixture was then distilled at 100-110 °C at 0.8 mm/Hg to give 55 g of 1 -(3,4-methylenedioxyphenyl)-l-butene as a colorless oil. Anal. (CnHl202) C.H. 

The practical method of preparing cyclohexene is the dehydration of cyclohexanol. Many reagents have been used for this purpose. The following is a partial list potassium bisulfate,1 oxalic acid,2 sulfuric acid,3 />-toluene sulfonic acid,4 and iodine.5 In addition, cyclohexanol has been dehydrated at high temperatures over various catalysts.6... 

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