Sodium Sulfide Na2S

Kraft Process. The dominant chemical wood pulping process is the kraft or sulfate process. The alkaline pulping Hquor or digesting solution contains about a three-to-one ratio of sodium hydroxide, NaOH, and sodium sulfide, Na2S. The name kraft, which means strength in German,... 

Use Figures 10-5 and 10-6 or Table 10-1 to decide which of the following soluble salts would permit a separation of magnesium and lead through a precipitation reaction sodium iodide, Nal sodium sulfide, Na2S sodium carbonate, Na2C03. 

Ans. (a) Sodium sulfide, Na2S (b) magnesium sulfide, MgS and (c) aluminum sulfide, AI SV The sulfide ion has a 2- charge. The sodium, magnesium, and aluminum ions have charges of 1 +, 2+, and 3+, respectively, and the subscripts given are the smallest possible to just balance the charges. 

Sodium sulfide, Na2S saturate NaOH solution with H2S, then add as much NaOH as was used in the original solution. 

Selective reduction (e.g., partial reduction of one of two nitro groups) is carried out with an alkali sulfide, such as sodium hydrogen sulfide NaHS ( sodium sulfhy-drate ) or sodium sulfide Na2S, in an aqueous or alcoholic solution. Azo groups are not affected by this method. The reaction converts sodium hydrogen sulfide or sodium sulfide mainly to sodium thiosulfate. 

Japanese researchers very carefully followed the oxidation of sodium sulfide Na2S (A) to sodium thiosulfate Na2S203 (R) in a batch reactor. Intermediates were measured and the results found were sketched in Fig. E8.3. 

There are two treatability groups of dissolved metals for chemical precipitation, complexed and non-complexed metals. Non-complexed metals can be removed by a direct precipitation with such a chemical as lime (Ca(OH) ), caustic (NaOH), sodium sulfide (Na2S), ferrous sulfide (FeS), or sodium carbonate (NajCOj). Complexed metals require coprecipitation with ferrous sulfate (FeS04), ferrous chloride (FeClj), or sodium dimethyl dithiocarbamate (DTC) in addition to a regular precipitant such as caustic or lime. Electrochemically generated ferrous ion is also effective in removing a wide variety of heavy metals, including hexavalent chromium. 

In a 4-I. beaker, 290 cc. of water is heated to boiling and 260 g. (1.08 moles) of crystallized sodium sulfide (Na2S 9H2O) and 34 g. of powdered sulfur are dissolved by heating and stirring. A solution of 40 g. of sodium hydroxide in 100 cc. of water is then added and the mixture cooled, first in cold water, and finally by a freezing mixture of ice and salt. 

Sodium sulfide (Na2S). dissolve 100 mg m 10 mL distilled water. Add 560 pL 1MHC1 Handle in fume cupboard. 

The sodium sulfide (Na2S-9H20) should be crystalline and finely divided. 

Dissolve an accurately weighed 15.0 g sodium sulfide (Na2S 9 H20) in 50 to 60 mL distilled water in a 100-mL volumetric flask. Dilute to the mark. Add one drop of this solution (0.05 mL) to 1 L of distilled water in a volumetric flask. Shake well. That makes the concentration of the solution as 1 mg S2 /L (1 ppm). Prepare five calibration standards in the range 1 to 10 mg S27L using 1 to 10 drops of the stock solution. To a 7.5-mL aliquot of each standard, add the reagents and follow the procedure described above under colorimetric method. Read the... 

Show how mustard gas could be prepared from ethylene oxide and sodium sulfide (Na2S). 

Sodium sulfide (Na2S) and sodium hydrosulfide, sometimes referred to as sodium sulfhy-drate (NaHS), share the same derivation caustic soda and H2S. Earlier processes, based on reduction of salt cake with coal, have largely been supplanted. In 2000, the U.S. installed capacity for NaHS was 184,000 tons/year. Additionally, there are more than 260,000 tons/year of lower-purity, lower-strength material recovered as byproduct from natural gas and small refinery operations.11 The source of H2S used in the manufacture of NaHS is essentially all byproduct. Controlled caustic scrubbing of H2S forms a solution of NaHS ... 

Sodium Sulfide TS Dissolve 1 g of sodium sulfide (Na2S-9H20) in water to make 10 mL. Prepare this solution fresh. 

Application To oxidize sodium sulfide (Na2S) component in the caustic scrubber effluent of olefin plants with air using wet air oxidation (WAO) process developed by Nippon Petrochemicals Co., Ltd. (NPCC), the license being available from Toyo Engineering Corp. (TEC). 

Sodium tungsten oxide (Na2 4) Sodium silicate (ifei2Si20g) Sodium silicate (Na2Si20g) Sodium silicate (Na2Si20g) Sodium sulfide (Na2S)... 

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