Potassium sulfite

Desulfurize the flue gas. A whole range of processes have been developed to remove SO, from flue gases, such as injection of limestone into the furnace, absorption into wet limestone after the furnace, absorption into aqueous potassium sulfite after the furnace, and many others.However, the byproducts from many of these desulfurization processes cause major disposal problems. 

Potassium sulfite is commonly used as a food preservative, because the sulfite anion undergoes reactions that release sulfur dioxide, an effective preservative. Determine the concentrations of the ionic species present in a solution of potassium sulfite that is 0.075 M. 

The problem describes a salt of a pol3/protic acid and asks for ion concentrations. To determine concentrations of all ions, we need to consider more than one equilibrium. This is done in stages, starting with the dominant equilibrium. We apply the seven-step strategy. The problem asks for the concentrations of the ions in aqueous potassium sulfite, in which the major species are, SO], and H2O. The potassium ion is a spectator ion. 

Other non-oxide semiconductors such as ZnS doped with Cu (Zn0.957Cu0.043S) [42], doped with Ni (Zn0.999Ni0.001S) [155] and codoped with Pb [156] have shown excellent solar hydrogen production in the presence, respectively, of aqueous potassium sulfite... 

Mercury(II) oxide dissolves in neutral sodium or potassium sulfite solution forming sulfitomercurate(II) ion ... 

Anonymous. Final report on the safety assessment of sodium sulfite, potassium sulfite, ammonium sulfite, sodium bisulfite, ammonium bisulfite, sodium metabisulfite and potassium metabisulfite. Int J Toxicol 2003 22(suppl 2) 63. 

HF (aq.). The earliest determination of the heat of formation of fluorine compounds was made by Berthelot and Moissan,1 who measured the heat of reaction between fluorine and an aqueous alkaline solution of potassium sulfite but their data are of historical interest only. Guntz1 found the heat of solution of hydrogen fluoride to be 11.8 von Wartenberg and Fitzner1 gave, for HF (g) (ideal) =HF (aq.), Q = 11.56. von... 

To prepare the necessary potassium sulfite Dissolve 44g of potassium metabisulfite m a solution of lOOg of potassium hydroxide in one liter of water, add 5 drops of phenol-phthalem indicator and then more of the 10% potash solution until a pink color just forms. Add the latter solution drop by drop from a separatory funnel KHSO f KOH ------- KaSOs + H 0]... 

Sulfite. Potassium sulfite, [CAS 10117-38-1], K2SO3 2H2O potassium hydrogen sulfite, KHSO3 white solids, similar in properties and formation to the corresponding sodium sulfites. 

Potassium pentachloronitrido-osmate(VI), 6 206 Potassium permanganate, solution of, standardization of, for determination of average atomic weight of rare earth elements in oxalates, 2 60, 61 Potassium pyrosulfite, 2 166 and its f-hydrate, 2 165, 167 Potassium rare earth sulfates, 2 47 Potassium selenocyanate, 2 186 Potassium sulfites, KHSO , in solution, 2 167... 

By far the most commonly used preservative is sodium sulfite. Potassium sulfite is only occasionally used in highly concentrated formulas such as Rodinal. 

Other chemicals that can be used to make stop baths are boric acid, citric acid, and sodium bisulfite. Chemicals that should not be used are chrome alum and potassium salts, such as potassium metabisulfite or potassium sulfite, either of which can cause green stains on some enlarging papers. In addition, the introduction of potassium salts into a fixing bath can convert the bath to potassium thiosulfate, which is nearly inactive as a fixing agent.1... 

Potassium sulfite, 25.0g Hydroquinone, l.Og +Potassium bicarbonate, lO.Og Water to make 1.0 liter... 

Dibutyl Methyl Telluronium Iodide2 95 mg (0.19 mmol) of dibutyl tellurium diiodidc, 20 ml of methyl iodide, 35 mg (0.22 mmol) of potassium sulfite, 24 mg (0.22 mmol) of sodium carbonate, and 5 ml of water are placed in a conical flask. The mixture is shaken vigorously, kept at 20° for 3 days, filtered, the filtrate is evaporated to dryness, and the residue is recrystallized from water yield 45 mg (62%) m.p. 157°. Similarly prepared were the following telluronium iodides ... 

Trimethyl Telluronium Picrate1 Trimethyl telluronium iodide, prepared from 1.6 g of dimethyl tellurium diiodide, potassium sulfite, and methyl iodide, is dissolved in water and a saturated aqueous solution of picric acid is added until precipitation of the telluronium picrate ceases. The solid is filtered off, washed with cold water, and dried in air yield 0.3 g (20% based on dimethyl tellurium diiodide) m.p. 127° (dec.). 

A beaker containing dilute hydrochloric acid is poured into a beaker containing a solution of potassium sulfite. 

A sample of potassium sulfite solution is mixed with an excess of dilute hydrochloric acid. 

Calculate the percentage by mass of water in potassium sulfite dihydrate, K2SO3 2H20. 

Potassium Sulfite occurs as a white granular powder. It undergoes oxidation in air. One gram dissolves in about 3.5 mL of water. It is slightly soluble in alcohol. 

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