Ferrous sulfate solution

Possible interferences and variation of results from modified techniques can be avoided by titrating the sample in exacdy the same way and by employing approximately the same amounts of materials as in the initial standardization of the ferrous sulfate against a known quantity of nitric acid. The ferrous sulfate solution is added in a thin stream until the initially yellowish solution turns brown. The titration is complete when the faint brownish-tinged end point is reached. 

The seeds are transferred to tanks containing scrap iron and a ferrous sulfate solution, and the mixture is heated to a temperature between 70 and 90°C. While the seeds circulate over the scrap iron, air is bubbled through the medium causing the seeds to grow. The process can be described by the following reactions ... 

A platinum-iron on silica gel catalyst was prepared by impregnating silica gel (BDH, for chromatographic adsorption) with an aqueous solution of chloroplatinic acid (analytical grade) and sodium hydroxide (analytical grade). The dry product was then impregnated by a ferrous sulfate solution (C.P. grade) and the water was removed in a rotating evaporator. The prepared catalyst contained 1% Pt, 0.7% Fe, and 2% NaOH (by... 

F-S [Ferrous sulfate] A process for removing ammonia, hydrogen sulfide, and hydrogen cyanide from coke-oven gas by scrubbing with aqueous ferrous sulfate solution obtained from steel pickling. A complex series of reactions in various parts of the absorption tower yield ammonium sulfate crystals and hydrogen sulfide (for conversion to sulfur or sulfuric acid) as the end products. Developed in Germany by F. J. Collin A.G. 

TRW Meyers [Named after the three CalTech professors who founded the company Thompson, Ramo, and Wooldridge] A chemical method for desulfurizing coal. The iron pyrites is leached out with a hot aqueous solution of ferric sulfate, liberating elemental sulfur. The resulting ferrous sulfate solution is re-oxidized with air or oxygen ... 

After completion of the reaction a 100 mL beaker containing the solution of ferrous sulfate-tartaric acid (20 mL) was pre-cooled at 0°C by means of an ice-water bath. The epoxidation reaction mixture was allowed to warm to 0 °C and then was poured slowly onto the pre-cooled, stirring ferrous sulfate solution. The two-phase mixture was stirred for 5-10 minutes the aqueous layer became brown. 

Mara pigments inorg chem A group of five pigments produced when milk of lime is added to a ferrous sulfate solution, and the precipitate is calcined color is controlled by calcination temperature to give yellow, orange, brown, red, or violet. marz. pig-msns ... 

Stahl, R.S. Fawning, D.S. James, B.R. (1993) Goethite and jarosite precipitation from ferrous sulfate solutions. Soil Sci. Soc. Am. J. 

Barium acetate converts to barium carbonate when heated in air at elevated temperatures. Reaction with sulfuric acid gives harium sulfate with hydrochloric acid and nitric acid, the chloride and nitrate salts are obtained after evaporation of the solutions. It undergoes double decomposition reactions with salts of several metals. For example, it forms ferrous acetate when treated with ferrous sulfate solution and mercurous acetate when mixed with mercurous nitrate solution acidified with nitric acid. It reacts with oxahc acid forming barium oxalate. 

The compound is obtained from the spent oxide of coal gas purifiers. In the laboratory it may be prepared by treating ferrous sulfate solution with a solution of potassium cyanide ... 

Colorless gas paramagnetic density 1.3402 g/L slightly heavier than air, air density 1.04 (air=l) liquefies at -151.8°C to a blue liquid the refractive index of the liquid 1.330 at -90°C the density of the liquid 1.269 g/mL at -150.2°C solidifies at -163.6°C to a bluish-white snow-hke solid critical temperature -94°C critical pressure 65 atm slightly soluble in water, 4.6 mL gas dissolves in 100 mL water at 20°C while 7.34 mL and 2.37 mL dissolve in the same volume of water at 0 and 60°C, respectively more soluble in alcohol than water soluble in carbon disulfide, and in ferrous sulfate solution (reacts). 

Nitric oxide forms a brown ring in cold ferrous sulfate solution (brown ring test for nitrates). Tbe reaction involves the replacement of a water molecule by nitric oxide in bydrated ferrous ion ... 

Potassium ferrocyanide may be prepared by the action of potassium cyanide with ferrous sulfate solution ... 

Homogenization with NaOAc solution at 100°C for lOmin Enzymatic digestion with acid phosphatase, papain, amylase, glucosidase with addition of glyoxylic acid, ferrous sulfate solution and Gh at 37°C for 18h centrifugation ... 

E) Acid ferrous sulfate solution, 0.5N. Dilute 8g of ACS reagent grade ferrous sulfate hepta-hydrate (FeS04.7H30) to the mark in a 1000-ml volumetric flask with distd water. Add... 

While stirring, add 200 g of inhibitor-free ethyl acrylate, 4 ml of the ferrous sulfate solution, and 1 g of sodium persulfate through the open neck of the kettle. 

ADD HYDROGEN PEROXIDE SOLUTION. LIGHT-GREEN FERROUS SULFATE SOLUTION TURNS REDDISH-BROWN. H,Oj HAS OXIDIZED FeSO TO FERRIC SULFATE (FeJSO, ,). 

TO ANOTHER PORTION OF FERROUS SULFATE SOLUTION ADD SODIUM CARBONATE SOLUTION. PURE CARBONATE MADE WITH NO OXYGEN PRESENT IS WHITE— BUT YOU GET MUDDY, WHITISH-GREEN PRECIPITATE OF FERROUS CARBONATE, EVENTUALLY TURNING INTO FERRIC HYDROXIDE. 

OXIDATION-REDUCTION INDICATOR. A substance that has a color in the oxidized form different from that of the reduced form and can be reversibly oxidized and reduced. Thus, if diphenylamine is present in a ferrous sulfate solution to which potassium dichromate is being added, a violet color appears with the first drop of excess dichromate. 

Colloidal silver is a more economical stain than colloidal gold. The staining procedure is rapid, although the ferrous sulfate solution must be prepared immediately before use. Transferred proteins (>5 ng/band) appear as black bands on a light brown background for nitrocellulose and on a dark background for PVDF. 

HPhe Fricke dosimeter (ferrous sulfate solutions) has been used to measure A the radiation intensity of various types of ionizing radiation sources since its development by Fricke and Morse in 1927 (2). It is widely accepted because it yields accurate and reproducible results with a minimum of care. This system meets many of the requirements specified for an ideal dosimeter (5, 9) however, it has a limited dose range, and for our applications it has been necessary to develop a dosimeter covering larger doses. Of the systems reviewed (6, 7), two (ferrous sulfate-cupric sulfate and ceric sulfate) showed the most promise for use with the radiation sources at the U. S. Army Natick Laboratories (8). Of these, the ferrous-cupric system has received the most use, and this paper describes our experience in using this system and suggests procedures by which it may be used by others with equal success. 

Wear nitrile gloves, laboratory coat, and eye protection. Work in the fume hood. Dilute the solution of cyanide with water to a concentration not greater than 2%. For each 50 mL of solution, slowly add, while stirring, 5 mL of 10% sodium hydroxide solution, and 60-70 mL of household bleach. Test the solution for continued presence of cyanide as follows. Remove about 1 mL of the solution and place in a test tube. Add 2 drops of a freshly prepared 5% aqueous ferrous sulfate solution. Boil the mixture for 30 seconds, cool to room temperature, and add 2 drops of 1% ferric chloride solution. Acidify the mixture to litmus with 6 M hydrochloric acid (slowly add concentrated acid to an equal volume of cold water). If cyanide is still present, a deep blue precipitate forms. If the test... 

Potassium Cyanide Solutions. Wear breathing apparatus, eye protection, laboratory coat, and butyl rubber gloves. Instruct others to keep a safe distance. Cover the spill with a 1 1 1 mixture by weight of sodium carbonate or calcium carbonate, clay cat litter (bentonite), and sand. Scoop the mixture into a container and transport to the fume hood. Slowly, and while stirring, add the slurry to a pail containing household bleach (about 70 mL/g of cyanide). Test the solution for the presence of cyanide using the Prussian blue test. To 1 mL of the solution, add 2 drops of a freshly prepared 5% aqueous ferrous sulfate solution. Boil the mixture for at least 60 seconds, cool to room temperature and add 2 drops of 1 % ferric chloride solution. Add 6 M hydrochloric acid (prepared by... 

Determination of Adsorbed Ceric Ion. In determining the amount of ceric ion adsorbed on the graft copolymers the volumetric titration was conducted. Here, a given excess amount of ferrous sulfate solution (0.01 N) was added into the aqueous solution of hydrolysis and then the solution was back-titrated with 0.01 IT ceric ammonium sulfate in a 1 IT sulfuric acid solution using o-phenanthroline as an indicator. In so doing the amount of ceric ion adsorbed on the grafted bamboo sample could thus be determined. 

Commercial amylbenzene is dried by distillation, and the fraction boiling at 184-194° is collected. This solvent has been withdrawn from the market (1950), and hence tetralin may be substituted. Commercial tetralin is washed with ferrous sulfate solution and distilled the fraction boiling at 202-206° is used. 0-Dichlorobenzene has also been recommended as a solvent.2... 

Ferrous Sulfate Solution Just before use, prepare a 10% aqueous ferrous sulfate solution containing 2 mL of 7.5 N sulfuric acid per 100 mL of final solution. 

Blank Mix 10.0 mL of water, 10.0 mL of Acid Molybdate Solution, and 5.0 mL of Ferrous Sulfate Solution. 

Procedure Transfer 10.0 mL each of the Standard Preparation and of the Test Preparation into separate 50-mL Erlenmeyer flasks, add 10.0 mL of Acid Molybdate Solution and 5.0 mL of Ferrous Sulfate Solution to each flask, and mix. Determine the absorbance of each preparation solution and the Blank in a 1-cm cell at 700 nm using a suitable spectrophotometer. The absorbance of the solution from the Test Preparation is not greater than that of the Standard Preparation. Free Riboflavin and Riboflavin Diphosphate (Note Conduct this test so that all solutions are protected from actinic light at all stages, preferably by using low-actinic glassware.)... 

Ferrous Sulfate Solution Dissolve 44 g of ferrous sulfate (FeS04-7H20) in ] N sulfuric acid, dilute to 100 mL with 1 N sulfuric acid, and mix. Use within 5 days of preparation. 

Ferric Sulfate TS, Acid Add 7.5 mL of sulfuric acid to 100 mL of water, and dissolve 80 g of ferrous sulfate in the mixture with the aid of heat. Mix 7.5 mL of nitric acid and 20 mL of water, warm, and add to this the ferrous sulfate solution. Concentrate the mixture until, upon the sudden disengagement of ruddy vapors, the black color of the liquid changes to red. Test for the absence of ferrous iron, and, if necessary, add a few drops of nitric acid and heat again. When the solution is cold, add sufficient water to make 110 mL. 

Orthophenanthroline TS Dissolve 150 mg of orthophen-anthroline (C12H8N2-H20) in 10 mL of a solution of ferrous sulfate, prepared by dissolving 700 mg of clear crystals of ferrous sulfate (FeS04-7H20) in 100 mL of water. The ferrous sulfate solution must be prepared immediately before dissolving the orthophenanthroline. Store the solution in well-closed containers. 

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