Ammonium acetate ethanoate

Ammonium acetate (ethanoate) solution, 20 per cent. Dissolve 20 g of the analytical grade salt in distilled water and dilute to 100 mL. 

Beryllium is sometimes precipitated together with aluminium hydroxide, which it resembles in many respects. Separation from aluminium (and also from iron) may be effected by means of oxine. An acetic (ethanoic) acid solution containing ammonium acetate is used the aluminium and iron are precipitated as oxinates, and the beryllium in the filtrate is then precipitated with ammonia solution. Phosphate must be absent in the initial precipitation of beryllium and aluminium hydroxides. 

The precipitate is soluble in free mineral acids (even as little as is liberated by reaction in neutral solution), in solutions containing more than 50 per cent of ethanol by volume, in hot water (0.6 mg per 100 mL), and in concentrated ammoniacal solutions of cobalt salts, but is insoluble in dilute ammonia solution, in solutions of ammonium salts, and in dilute acetic (ethanoic) acid-sodium acetate solutions. Large amounts of aqueous ammonia and of cobalt, zinc, or copper retard the precipitation extra reagent must be added, for these elements consume dimethylglyoxime to form various soluble compounds. Better results are obtained in the presence of cobalt, manganese, or zinc by adding sodium or ammonium acetate to precipitate the complex iron(III), aluminium, and chromium(III) must, however, be absent. 

Hydroxyqninoline (oxine). Iron (III) ca 30 mg in 25 mL of weakly acidic (HCl) solution). Add a solution of 3 g ammonium acetate in 125 mL water, followed by 12-15mL of reagent solution 2 per cent in 2M acetic (ethanoic) acid. Heat the solution at 80-90°C for 30 minutes, filter and wash the precipitate with 1 per cent acetic acid and with water. Dry at 130-140 °C and weigh as Fe(C9H6ON)3 (Section 11.28). 

Determination of chlorate as silver chloride Discussion. The chlorate is reduced to chloride, and the latter is determined as silver chloride, AgCl. The reduction may be performed with iron(II) sulphate solution, sulphur dioxide, or by zinc powder and acetic (ethanoic) acid. Alkali chlorates may be quantitatively converted into chlorides by three evaporations with concentrated hydrochloric acid, or by evaporation with three times the weight of ammonium chloride. 

Buffer solution, concentrated. Dissolve 27.5 g ammonium acetate and 11.0 g hydrated sodium acetate in 100 mL water add 1.0 mL glacial acetic (ethanoic) acid and mix well. 

Materials Required Ammonium nickel sulphate (pure) 0.0135 g phthalate or acetate (ethanoate) buffer (pH 6.0) 5 ml dilute ammonia solution chloroform 15 ml sodium hydroxide (0.1 M) 10.0 ml ... 

CEC or CEC-7 the CEC determined with 1 M ammonium ethanoate (ammonium acetate) buffered at pH 7.0... 

A novel approach to the synthesis of a 1,5-naphthyridine starts from quinuclidin-3-one (143), which is first converted to the 2-arylidene derivative and then reacted with phenacyl-pyridinium bromides and ammonium acetate to give l,4-ethano-3,4-dihydro-2//-l,5-naph-thyridines (144) (82S27). 

As already mentioned and will be discussed more fully later in this chapter, amines are basic compounds. Bases can be converted to their salts with adds. Use of vinegar (dilute, flavored ethanoic acid [acetic add CH3CO2H]) and lemon juice (dtric acid, vide infra) converts the odoriferous amines to their ammonium salts, which have much diminished vapor pressures and, arguably, different odors. 

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