Of ferric ammonium sulfate

IQ. To determine the concentration of chloride ion, - a 5-mL aliquot of the methyl lithium solution is cautiously added to 25 ml of water and the resulting solution is acidified with concentrated sulfuric acid and then treated with 2-3 ml of ferric ammonium sulfate [Fe(NH4)( 04)2 12 H2O] indicator solution and 2-3 ml of benzyl alcohol. The resulting mixture is treated with 10.0 mL of standard aqueous 0.100 M silver nitrate solution and then titrated with standard aqueous 0.100 H potassium thiocyanate solution to a brownish-red endpoint. 

Elemental composition K 40.23%, S 33.00%, C 12.36%, N 14.41%. Potassium can be measured in an aqueous solution by flame photometry, AA, or ICP/AES (see Potassium). Thiocyanate anion can be measured by Volhard titration against a standard solution of silver nitrate in the presence of ferric ammonium sulfate. The color of the solution turns red at the end point. 

V = ml of ferric ammonium sulfate soln required for the blank... 

Vj = ml of -ferric ammonium sulfate soln required to titrate the excess TiCl3 after reduction of DNEcBz N =b normality of the ferric ammonium sulfate soln... 

N = normality of ferric ammonium sulfate soln and W = wt of dry sample... 

Normality of ferric ammonium sulfate soln is determined from the expression (AxN) / B, where A = ml of K dichromate soln N = its normality (0.2000) and B = ml of ferric ammonium sulfate taken for titration... 

F =its normality C=ml TiClg soln added to blank D=ml of ferric ammonium sulfate soln used for blank W=wt of sample represented by the aliquot taken (ca 2.0g)... 

Dissolve 5 mg in 5 ml of 0.1 M hydrochloric acid and add 3 mg of p-phenylenediamine dihydrochloride shake to dissolve and add 0.1 g zinc powder. After mixing, allow to stand for 2 min and add 10 ml of ferric ammonium sulfate solution. A blue or violet-blue color develops [7],... 

Visual titration was also reported, the excess of silver being titrated with potassium thiocyanate in the presence of ferric ammonium sulfate indicator [51]. Mercuric nitrate titrations were also reported [62]. 

Weigh accurately about 400 mg of acetylcholine chloride, previously dried at 105°C for 3 h, and dissolve in 50 mL of water in a glass stoppered 125mL flask. Add with agitation 30.0 mL of 0.1 N silver nitrate VS, then add 5mL of nitric acid and 5mL of nitrobenzene and shake well. Thereafter, add 2mL of ferric ammonium sulfate TS, and titrate the excess silver nitrate with 0.1 ammonium thiocyanate VS. Each milliliter of 0.1 N silver nitrate is equivalent to 3.545mg of Cl. Between 19.3 and 19.8% of Cl is found. 

Sodium Chloride Content Accurately weigh about 20 mg of sample, and dissolve it in 50 mL of water contained in a glass-stoppered flask. Add, while agitating, 3 mL of nitric acid, 5 mL of nitrobenzene, 50.0 mL of 0.1 N silver nitrate, and 2 mL of ferric ammonium sulfate TS. Shake well, and titrate the excess silver nitrate with 0.2 N ammonium thiocyanate. The titration endpoint is indicated by the appearance of a red color. Perform a blank determination (see General Provisions). Calculate the content of sodium chloride in the sample by the formula... 

Sodium Chloride Dissolve about 10 g of sample, accurately weighed, in 50 mL of water in a 250-mL beaker. Add sufficient nitric acid to make the solution slightly acid, then add 1 mL of ferric ammonium sulfate TS and 1.00 mL of 0.05 A ammonium thiocyanate, and titrate with 0.05 A silver nitrate, stirring constantly, until the red color completely disappears. Finally, back titrate with 0.05 A ammonium thiocyanate until a faint red color appears. Subtract the total volume of 0.05 A ammonium thiocyanate added from the volume of 0.05 A silver nitrate required. Each milliliter of 0.05 A silver nitrate is equivalent to 2.922 mg of sodium chloride (NaCl). Calculate the percentage of sodium chloride in the sample taken. Water Calculate the percentage of water by subtracting from 100 the sum of the percentages of Sodium Bicarbonate, Sodium Carbonate, and Sodium Chloride found in the sample. 

Transfer 50 mL of filtrate to a 250-mL flask. Add 2 mL of 6 N nitric acid, 5 mL of nitrobenzene, and 10 mL of standardized 0.1 N silver nitrate solution. Shake the flask until the silver chloride coagulates. Prepare a saturated solution of ferric ammonium sulfate, and add just enough concentrated nitric acid to discharge the red color add 1 mL of this solution to the 250-mL flask to serve as the indicator. Titrate with 0.1 N ammonium thiocyanate solution that has been standardized against the silver nitrate solution until the color persists after shaking for 1 min. Calculate the weight percent of sodium chloride, P, by the equation... 

Ferric Ammonium Sulfate TS Dissolve 8 g of ferric ammonium sulfate [FeNH4(S04)2-12H20] in sufficient water to make 100 mL. 

Ammonium Thiocyanate, 0.1 N (7.612 g NH4SCN per 1000 mL) Dissolve about 8 g of ammonium thiocyanate (NH4SCN) in 1000 mL of water, and standardize by titrating the solution against 0.1 N Silver Nitrate as follows Transfer about 30 mL of 0.1 N Silver Nitrate, accurately measured, into a glass-stoppered flask. Dilute with 50 mL of water, then add 2 mL of Ferric Ammonium Sulfate TS and 2 mL of nitric acid, and titrate with the ammonium thiocyanate solution to the first appearance of a red-brown color. Calculate the normality, and, if desired, adjust the solution to exactly 0.1 A. If desired, 0.1 N Ammonium Thiocyanate may be replaced by 0.1 A potassium thiocyanate where the former is directed in various tests and assays. 

Mercuric Nitrate, 0.1 M [32.46 g Hg(N03)2 per 1000 mL] Dissolve about 35 g of mercuric nitrate [Hg(N03)2-H20] in a mixture of 5 mL of nitric acid and 500 mL of water, and dilute with water to 1000 mL. Standardize the solution as follows Transfer an accurately measured volume of about 20 mL of the solution into an Erlenmeyer flask, and add 2 mL of nitric acid and 2 mL of Ferric Ammonium Sulfate TS. Cool to below 20°, and titrate with 0.1 N Ammonium Thiocyanate to the first appearance of a permanent brown color. Calculate the molarity. 

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