NaOH NaCl Mixtures

Traces of Mo and W have been separated from other metals on anion-exchangers from mixtures of sulphuric acid with hydrogen peroxide. The tungsten retained on the column is eluted with NaOH-NaCl solution [32]. 

In contrast, germanium oxide was found to be appreciably soluble in the molten equimolar KCl-NaCl mixture and its solutions show weak acidic properties. Its acid-base titration using NaOH as a titrant results in the appearance of a small pO drop at the equivalence point ( 1 pO unit), which corresponds to the ligand number value —0.5. This allows us to conclude that the acid-base titration runs in one step, and the final product is di-germanate ion, Gc202... 

The active eluent from the XAE>-2 column was stripped of volatile solvents and the remaining aqueous mixture was made basic with a few drops of concentrated NaOH. This mixture was extracted with petroleum ether and the oonbined organic phases were back-extracted with acetonitrile vhich was added to the aqueous phase. The aqueous phase was then extracted with acetonitrile. The oorabined acetonitrile phases were dried with a single partition against saturated NaCl (aq.) and reduced in volume. 

Sorensen s buffered solutions were adjusted by the mixture of 0.1 M NaCl, 0.1 M glycine, and 0.1 M NaOH solutions. Amount of Na+ transported was about zero in the all range... 

For the large scale synthesis, the sodium salt of 2 formed in the NaCN-NaOH reaction could be purified by brominated polystyrene resin S P-207 chromatography to avoid acidic work-up which generates HCN. The SP-207 resin was first saturated with 1 M NaCl, and the crude reaction mixture was loaded onto the column. The column was then eluted with 1M NaCl to remove inorganic salts such as excess NaCN and NaOH and other polar impurities. Eluant switching to MeOH-H20 eluted the sodium salt of 2. Fractions containing >98.5 A% of... 

Chloroethyl ether (16.37, 0.11 mol) was then slowly added over a period of 15 min. After the reaction mixture was heated at 110-130°C for an additional 2 h, it was filtered to remove the NaCl. The filtrate was cooled and poured into ice water containing 1% Na2S03 and 2% NaOH. The white gummy mass that separated was triturated with hexane and then with water to afford 22.17g (70%) of white powder. 

HFB, the reaction mixture was poured into 25 ml of ethyl ether and 50 ml of distilled water. The aqueous layer was discarded and the organic layer was washed twice with 25-ml portions of 10% aqueous NaOH and with 25 ml of a saturated NaCl solution. The ether solution was dried (MgS04) and concentrated (rotary evaporation) to give a crude product in ca. 90% yield. The crude products were recrystallized usually from ethanol or ethanol H20 to yield primarily the para-disubstitution products. 

The ether extract contains benzenesulfonyl diethylamine, some dibenzenesulfonyl ethylamine and the excess of benzenesulfonyl chloride. Evaporate the ether, warm the residual oil for half an hour, with 10 ml of 6 M NaOH with enough ethanol to keep the oil in solution (dissolved). Cool with an ice and CaCl mixture, seed by rubbing or scratching a glass rod in the vessel, and with stirring, dilute slowly with 100 ml of NaCl solution (30 g of NaCl per liter). Allow to stand for 12-16 hours. Remove the benzenesulfonyl diethylamine by filtration and wash with cold, saturated (this is not the same as above) NaCl solution. Add the filtrate to the NaOH solution. 

Mercury electrodes were also polarized anodically in the solutions containing NaOH, HCIO4, NaCl, Nal, NaF, Na2S04, NaHC03, Na2C03, and tartaric and citric acids [78]. The solutions contained only one species, or the mixture of species, and no supporting electrolyte was added. For many of the above salts, linear caKbra-tion plots were obtained and, therefore, analytical possibiKties were discovered. Anodization of mercury was also carried out in the real samples (wine, rain, tap and mineral water). 

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