Preparation, NaOH

The prepared NaOH solution is a secondary standard because its concentration is determined by titration against a primary standard. 

NaOH in 1 L water. Standardize as follows accurately weigh to the nearest 0.001 g approximately 1 g potassium hydrogen phthlate, KC8H504, MW = 204.3 g/mole, and dissolve it in 20 mL water. Add a few drops of phenolphthalein and titrate the potassium hydrogen phthalate with the prepared NaOH solution. The normality (N) of the NaOH solution is calculated as follows ... 

In some preparations, NaOH solutions were introduced into the magnesium sulfate solution and the solution of sodium metasilicate in the course of the precipitation process. 

The aqueous buffer was prepared using double-distilled water, citric acid and sodium citrate, with 0.01 wt% sodium azide (Sigma Chemicals) added as an antimicrobial agent. The buffer solution was heated to 50 °C and pectin powder was added slowly with gentle stirring. The pH of the resulting pectin solution was adjusted to pH 4.7 or pH 7 by adding a few drops of freshly prepared NaOH (1 M) solution. 

A) TiCU (Fluka) was added dropwise to water or to a NaN3 solution (Ti N molar ratio 1 4 or 1 40). In all cases a white suspended solid was obtained. The pH of the resulting suspension was 0.7. In some preparations NaOH was added to adjust the pH to 3.0 or 5.5. The suspension was stirred for 12 h and, after centrifugation, the precipitate was washed and dried at 298 K. Table 1 reports the preparation conditions of the various samples. 

In the photo-catalytic reaction we use visible or UV-light to irradiate the catalyst instead of light. The reaction is conducted at room temperature. Sato and White first reported the first photo-catalytic WGS reaction on Pt/Ti02 catalyst [22]. Then, they prepared NaOH-coated Pt/Ti02 catalysts for the photo-WGS reaction. When Pl/ri02 was coated with NaOH, the photo-catalytic activity... 

The enormous influence of carbonate impurities in conventionally prepared NaOH eluents on the selectivity of monosaccharide separations is demonstrated in Figure 3.231. Without rinsing the separator column with a concentrated sodium hydroxide solution after every chromatographic run, the retention time of mannose at the 14th injection becomes identical to that of glucose in the 5th run. So far, acceptable retention time stability could be achieved only by post-chromatographic rinsing of the separator column with a more concentrated NaOH solution. This increases the analysis time per sample to about 50 min. 

Figure 3.231 Carbonate-induced retention time decrease for monosaccharides with conventionally prepared NaOH eluents without postchromatographic column cleanup. Separator column CarboPac PA10 eluent ...

Obtained by fusing o-t nzenedisulphonic acid with NaOH. It is used as a photographic developer, for preparation of dyes and pharmaceuticals, and as an antioxidant. 

HOOCCH2CH2CH2COOH. M.p. 97-98 C, b.p. 302-304°C. Prepared by treating 1,3-dichloropropane with sodium cyanide and heating the product with NaOH. Forms an anhydride on heating at 230-280 C. glutathione, glutamylcysteinylglycine, GSH, CioH. NaOfiS. M.p. 190-192 C (decomp.). 

Glycerol -dichlorohydrin, 2.3-dichloro-propanol, CH2CI CHC1 CH2 0H. Colourless liquid, b.p. 182 C. Prepared by the chlorination of propenyl alcohol. Oxidized by nitric acid to 1,2-dichloropropionic acid. Reacts with NaOH to give epichlorohydrin. 

It is prepared by reduction of nitrobenzene with iron and NaOH. It is also prepared by an electrolytic reduction of nitrobenzene. It is widely used for the preparation of benzidine. 

Malic acid crystallizes in colourless needles m.p. lOO C. It o- curs in many acid fruits, such as grapes, apples and gooseberries. It can be prepared by microbiological processes using various moulds or from ( + )-bromosuccinic acid by the action of NaOH. 

Prepared commercially by NaOH fusion of sodium naphthalene-2-sulphonate. 

Prepared by the action of chloroethanoic acid upon anthranilic acid. It can also be prepared by the action of KCN and methanal on anthranilic acid, followed by hydrolysis with NaOH of the nitrile of anthranilic acid first produced. 

It occurs in many natural glycosides. It can be prepared by fusing resorcinol with NaOH and is manufactured from trinitrotoluene via trinitrobenzoic acid and triaminobenzene. 

Prepared generally by ester interchange from polyvinylacelate (ethanoate) using methanol and base also formed by hydrolysis of the acetate by NaOH and water. The properties of the poly(vinyl alcohol) depend upon the structure of the original polyvinyl acetate. Forms copolymers. Used as a size in the textile industry, in aqueous adhesives, in the production of polyvinyl acetates (e.g. butynal) for safety glasses. U.S. production 1980... 

Raney nickel A special form of nickel prepared by treating an Al-Ni alloy with NaOH solution. The nickel is left in a spongy mass which is pyrophoric when dry. This form of nickel is a most powerful catalyst, especially for hydrogenations. 

Obtained by K.OH fusion of many resins. Prepared by fusion of m-benzenedisulphonic acid with caustic soda, also obtained to some extent in the NaOH fusion of o-and p-ben-zenedisulphonic acids. 

SNG Substitute natural gas. soaps Sodium and potassium salts of fatty acids, particularly stearic, palmitic and oleic acids. Animal and vegetable oils and fats, from which soaps are prepared, consist essentially of the glyceryl esters of these acids. In soap manufacture the oil or fat is heated with dilute NaOH (less frequently KOH) solution in large vats. When hydrolysis is complete the soap is salted out , or precipitated from solution by addition of NaCl. The soap is then treated, as required, with perfumes, etc. and made into tablets. 

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