Ammonium thiocyanate NH4SCN

FIGURE 6.9 The endothermic reaction between ammonium thiocyanate, NH4SCN, and barium hydroxide octahydrate, Ba(0H)2-8H20, absorbs a lot of heat and can cause water vapor in the air to freeze on the outside of the beaker. 

A.3.5.6 Preparation of 20 Percent Solution of Ammonium Thiocyanate. Dissolve 60g of reagent grade ammonium thiocyanate (NH4SCN) in 240ml of distd w. Filter until clear and store 4.4.3.5.7 Preparation of 6N Hydrochloric Acid. 

Ammonium Thiocyanate TS (1 A) Dissolve 8 g of ammonium thiocyanate (NH4SCN) 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. 

Ammonium tetrathiocyanatomercurate(II) (0 3m). Dissolve 9 g ammonium thiocyanate, NH4SCN, and 8 g mercury(II) chloride, HgCl2, in water and dilute to 100 ml. 

Ammonium thiocyanate (saturated solution in acetone). Shake 1 g ammonium thiocyanate, NH4SCN, with 5 ml acetone, and use the clear supernatant liquid for the tests. 

Cobalt(II) thiocyanate (10%). Dissolve 1 g cobalt acetate tetrahydrate CO(CH3COO)2.4H20 in 5 ml water. In a separate vessel dissolve 1 g ammonium thiocyanate, NH4SCN, in 5 ml water, and mix the two solutions. 

Af Ammonium thiocyanate (NH4SCN) dissolved in water and stored in a brown glass bottle at 4°G... 

Ammonium thiocyanate NH4SCN -48.1 Barium iodide Bal2 -124.4... 

Ammonium thiocyanate NH4SCN Potassium thiocyanate KSCN Sodium thiocyanate NaSCN. 

Lithium chloride (LiCl)/N,N-dimethylacetamide (DMAc) was employed as a solvent for cellulose by McCormick et al. [83]. Turbak and coworkers were the first to spin cellulose fibers from this solvent system and studied the process extensively [84]. Patel and Gilbert were the first to report the lyotropic mesophase of cellulose in mixtures of trifluoroacetie acid (TFA) and chlorinated alkanes, such as 1,2-dichloroethane and methylene chloride [85]. Other solvents proposed for cellulose include ammonia (NH3)/ammonium thiocyanate (NH4SCN), calcium thiocyanate (Ca(SCN)2)/water, zinc chloride (ZnCl)/water, sodium hydroxide (NaOH)/urea [86], NaOH/thiourea [87, 88], and phosphorie aeid [89, 90]. 

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