Sodium bicarbonate Iron compounds

The nitroparaffins are condensed with aldehydes to yield nitro alcohols (70-80%), which on acetylation and treatment with an aqueous methanolic solution of sodium bicarbonate are converted to nitroolefins (80-84%). These compounds are reduced to the corresponding ketoximes by zinc and acetic acid (50-60%). Reduction with iron and dilute hydrochloric acid gives good yields of either ketones or ketoximes, depending upon the amount of hydrochloric acid used. The ketoximes can be hydrolyzed to ketones by refluxing with dilute sulfuric acid in the presence of formalin, which acts as a hydroxylamine acceptor (80%). The over-all yields from the nitroolefins are 40-60%. In this manner, certain otherwise difficultly obtainable ketones are prepared. Semicarbazones have been converted to ketones by treatment with sodium nitrite in glacial acetic acid, with aqueous oxalic acid, or with phthalic anhydride. ... 

The anhydrous salt [Co(NH3)g][Co(C03)3] made by the method of McCutcheon and Schule or more simply by adding [Co(NHj)gPC3 to a green solution prepared by Procedure 1, is much more stable when it is dry. The compound is soluble to the extent of only ca. 0.04 g per 100 cm of water at room temperature, the solution being quite unstable. However, the compound is ten times more soluble in an aqueous solution of potassium or sodium bicarbonate. Baur and Bricker used this compound as a reagent for titrimetric oxidation the compound is a very weak oxidant in bicarbonate media, but in an acid solution the cobalt(III) in the [Co(C03)3] portion is released and reacts quantitatively with reductants such as iron(II), vanadium(IV) and cerium(III). 

Reaations of the Hydroxyl Gmup. The hydroxyl group is acidic, with pK = 7 245J,so that it isa stronger acid than phenol but a weaker acid than acetic acid [277]. Simpler tropolones are soluble in aqueous sodium bicarbonate. They form coloured products with iron(III) chloride and form chelates with many metals. The copperCH) and iron(III) complexes are soluble in organic solvents and are easily purified crystalline compounds, and in consequence have been used for the separation and purification of tropolones. 

Write formulas for each of the following compounds (a) ammonium hydrogen sulfite, (b) sodium hydrogen sulfide, and (c) iron(II) bicarbonate. 

In solution, particularly in the presence of stxiium bicarbonate. the salt will darken on standing (see salicylic acid). This darkening may be lessened by the addition of sodium sulfite or sodium bisulfite. Also, use of recently boiled distilled water and dispensing in amber-colored bottles lessens color change. Sodium salicylate forms a eutectic mixture with antipyrine and produces a violet coloration with iron or its salts. Solutions of the compound must be neutral or slightly basic to prevent precipitation of free salicylic acid. The USP salt forms neutral or acid solutions, however. 

In turbulent streams, suspended solids range from small pebbles down to colloidal clay particles 0.1 to 0.001 xm in diameter. The water may also contain organic soUds, algae, and bacteria. Dissolved inorganic solids are usually bicarbonates, sulfates, and chlorides of calcium, magnesium, and sodium, as well as compounds of siUca, iron, and manganese. Nonfer-rous metals and organic compounds may be present in low concentrations, which nevertheless exceed the EPA s proposed limits. 

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