Sodium hydroxide, solution preparation

Prepare another 4-hydroxy benzoic acid solution (D2) by placing 10.0 mL of solution A 2 in a 100 mL graduated flask and making up to the mark with 0AM sodium hydroxide solution. Prepare a similar solution D3 from solution A3 and record the absorption spectra of these two new solutions. 

Fit a 250-ml three-necked flask with a reflux condenser, a high-speed sealed stirrer (1) and a gas inlet tube extending to a point just above the bottom of the stirrer. Place 28.5 g (0.15 mol) of 2-naphthoyl chloride (Expt 6.161), 100 ml of sodium-dried xylene, 3 g of palladium-barium sulphate catalyst and 0.3 ml of the stock poison solution (Section 4.2.54, p. 452) in the flask. Connect the top of the condenser by a rubber tube to a 6-mm glass tube extending to the bottom of a 250-ml conical flask containing 200 ml of distilled water and a few drops of phenolphthalein indicator arrange a burette charged with c. 1m sodium hydroxide solution (prepared from the pure solid) for delivery into the flask. The apparatus must be sited in the fume cupboard. 

Small Quantities. Wear nitrile rubber gloves, laboratory coat, and eye protection. Work in the fume hood. To decompose 5 mL (5.4 g) of acetic anhydride, place 60 mL of a 2.5 M sodium hydroxide solution (prepared by dissolving 6.0 g of NaOH in 60 mL of water) in a 250-mL, three-necked, round-bottom flask equipped with a stirrer, dropping funnel, and thermometer. Add the acetic anhydride to the dropping funnel and run it dropwise into stirred solution at such a rate that the temperature does not rise above 35°C. Allow to stir at room temperature overnight. Neutralize solution to pH 7 with 2 M hydrochloric acid (slowly add 16 mL of concentrated acid to 80 mL of cold water) and pour into the drain.23... 

N Sodium Hydroxide Solution Prepare daily by diluting 10 mL of analytical-grade 1 N sodium hydroxide to 500 mL with recently boiled water. 

Sodium Hydroxide Solution Prepare a solution containing 50.0% by weight of NaOH, and protect from contact with carbon dioxide. Allow the solution to settle, and use only the clear liquid. 

Biphenol (0.93 g, 5 mmol) and monomer 10 (0.83 g, 5 mmol) are dissolved in the CO2/O2-free sodium hydroxide solution prepared in step 2 above. The solution is then placed into a household blender to form the aqueous phase of the interfacial polymerization. Then, tetrabutylammonium hydrogen sulfate (0.18 g, 0.05 mmol) is added as phase transfer catalyst. 

M sodium hydroxide solution Prepare 1 liter of a 0.1 M sodium hydroxide stock solution by dissolving 4 g NaOH in 1 liter of water. 

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