Dilute acetic acid

At the end of about an hour,f filter the solution and tfansfer 20 ml. of the clear filtrate to a boiling-tube. Dissolve 2 5 ml. of phenylhydrazine in 3 ml. of glacial acetic acid diluted with 3 ml. of water, and add this solution to that in the boiling-tube. Mix well and place the tube in a boiling water-bath. After about 15 minutes, crystals of glucosazone begin to separate. At the end of about i hour, filter off the precipitate and identify (p. 319). 

Acetic Acid, Dilute. Approv. 4/I/, Dilute 230 ml. of glacial acetic acid with water until total volume is i litre. 

Dissolve 5 g. of finely-powdered diazoaminobenzene (Section IV,81) in 12-15 g. of aniline in a small flask and add 2-5 g. of finely-powdered aniline hydrochloride (1). Warm the mixture, with frequent shaking, on a water bath at 40-45° for 1 hour. Allow the reaction mixture to stand for 30 minutes. Then add 15 ml. of glacial acetic acid diluted with an equal volume of water stir or shake the mixture in order to remove the excess of anihne in the form of its soluble acetate. Allow the mixture to stand, with frequent shaking, for 15 minutes filter the amino-azobenzene at the pump, wash with a little water, and dry upon filter paper Recrystallise the crude p-amino-azobenzene (3-5 g. m.p. 120°) from 15-20 ml. of carbon tetrachloride to obtain the pure compound, m.p. 125°. Alternatively, the compound may be recrystaUised from dilute alcohol, to which a few drops of concentrated ammonia solution have been added. 

Method 2 (from the free amine). Dissolve 9 - 3 g. (9 1 ml.) of aniline in 10 ml. of glacial acetic acid diluted to 100 ml. contained in a 250 ml. beaker or conical flask, and add with stirring or shaking a solution of 6 5 g. of pure sodium cyanate in 50 ml. of warm water. Allow to stand for 30 minutes, then cool in ice, and allow to stand for a further 30 minutes. Filter at the pump, wash with water and dry in the steam oven. The resulting phenylurea is generally colourless and has a m.p. of 148° (i.e., is pure) the yield is 11 g. If the colour or the m.p. of the product is not quite satisfactory, recrj stallise it from boiling water (10 ml. per gram) as in Method 1. 

The solution containing sodium malate is neutralized with acetic acid, diluted to contain about 5 per cent of sodium... 

Reaction.—Dissolve a diop of phenylhydrazine in two diojis of glacial acetic acid, dilute with about i c.c. of water, and acid a diop of pyruvic acid. A yellow crystalline piecipitate of tlio phen)Ihydrazone, CH3.C (N.NH.C(,H5).CO.OH, is formed. 

Add to a few drops of phenylhydrazine an equal quantity of glacial acetic acid, dilute with a little water, and Reid a... 

To the cooled solution is added dropwise with stirring, a solution of 64 g (0.48 mole) of -amyl nitrate in 100 ml of dry tetrahydrofuran during a period of 1 hour. The solution is finally allowed to warm to room temperature overnight. Work-up is carried out by adding an excess of ice-acetic acid, diluting with water, and extracting the aqueous solution several times with ether. The ether extracts are washed thoroughly... 

Various chromogenic reagents have been used for the spectrophotometric determination of boron in seawater. These include curcumin [108,109], nile blue [110], and more recently 3,5 di-tert butylcatechol and ethyl violet [111]. Uppstroem [108] added anhydrous acetic acid (1 ml) and propionic anhydride (3 ml) to the aqueous sample (0.5 ml) containing up to 5 mg of boron per litre as H3BO3 in a polyethylene beaker. After mixing and the dropwise addition of oxalyl chloride (0.25 ml) to catalyse the removal of water, the mixture is set aside for 15-30 minutes and cooled to room temperature. Subsequently, concentrated sulfuric-anhydrous acetic acid (1 1) (3 ml) and curcumin reagent (125 mg curcumin in 100 ml anhydrous acetic acid) (3 ml) are added, and the mixed solution is set aside for at least 30 minutes. Finally 20 ml standard buffer solution (90 ml of 96% ethanol, 180 g ammonium acetate - to destroy excess of protonated curcumin - and 135 ml anhydrous acetic acid diluted to 1 litre... 

Reactions in solvents other than carboxylic acids (e.g., ethers, alcohols, esters, hydrocarbons, etc.) under conditions given in Table I do not produce detectable amounts of ethylene glycol (less than about 0.02 mmole). (Experiments were carried out to demonstrate that glycol would survive had it been produced in some of these solvents.) However, methanol yields nearly equivalent to those obtained in acetic acid are found in some of these solvents (cf. reactions 1, 10 and 11 in Table I). Reactions in acetic acid diluted with these solvents also give... 

In this method approximately 19 samples of marine sediment were oven dried at 110°C then digested with nitric acid-perchloric acid and hydrofluoric acid-hydrochloric acid. The digested solution is made up to 50ml of an equal volume mixture of 6M hydrochloric acid and 2M nitric acid. 0.1ml or less of the digest was pipetted into the hydride generator, followed by 1ml 2M acetic acid, diluted to 100ml with double distilled water and reacted with sodium borohydride. 

This is the same question as number 15 in Chapter 4. Use 5.0 ml of 17 M acetic acid and 12 g of sodium acetate. Dissolve the sodium acetate in water, add the 17 M acetic acid, dilute to 500.0 mL, and shake. 

Acetic acid Dilute Unknown Unknown Stol... 

The checkers found that crude chloromethylnaphthalene obtained from the preparation in Organic Syntheses could be used with good results. Naphthalene, paraformaldehyde, hydrochloric acid, and phosphoric acid are heated under reflux according to the procedure described. After the crude product is washed with water, 10% potassium carbonate, and water, it is dissolved directly in 500 ml. of glacial acetic acid, diluted with 500 ml. of water, and treated with hexamethylenetetramine by the procedure described above. The over-all yield of almost colorless 1-naphthaldehyde is 162 g., b.p. 162-164°/18 mm. Wq 1.6503 (52% yield based on naphthalene). 

Nitroguanidine is dissolved in acetic acid, diluted to approximately 10%, treated with zinc dust in the cold, set aside for thirteen to nineteen minutes and filtered 6% cupric sulphate solution is than added to the filtrate. The solution turns intensely blue and on boiling, becomes turbid, gives off gas and deposits a precipitate of metallic copper. If silver acetate is added instead of cupric sulphate a precipitate of metallic silver is deposited on boiling. 

According to Gnehm [86] methylene blue, when subjected to the action of nitric acid (density 1.33, i.e. 52%) in presence of acetic acid diluted to 50%, yields dinitrodimethylthionine nitrate of suggested structure (I). 

Hydrochloric Acid. — 5 cc. of acetic acid diluted with 50 cc. of water should afford no turbidity on the addition of 5 cc. of nitric acid followed by silver nitrate solution. 

Potassium. To a solution of ft gin. of eryslnlli/.eil eohall acetate in 1 li cc. of water add a solution of 10 gin. <>( odium nitrite in 20 cc. or water previously acidulated with d er of diluted acetic acid. Dilute the. sulutimi with. .Vi er ut water and allow it. to aland twenty lour hours at lit to. itr u yellow iroc.i iitute should form wiltiin this lime. 

Two grams of silver acetate, 2 cc. of glacial acetic acid, diluted to 100 cc., warmed, filtered, and allowed to cool. 

Mixing aqueous samples with 1 ml 0.088% N-bromosuccinimide (NBS) and 1 ml 5% acetic acid, dilution to 10 ml with water, equilibration for 20 min, addition of 1 ml 0.3% 4-(methylamino)-phenol sulfate, equilibration for 2 min, addition of 2 ml 0.2% sulfanilamide, dilution to 25 ml with water, and absorbance measurement at 520 nm within 10-30 min. 

M acetic acid. Dilute acetic acid to a concentration of... 

White precipitate of calcium tartrate soluble in dilute acetic acid, dilute mineral acids, and in cold alkali solutions White precipitate, the reaction is ... 

To make 28% acetic acid from glacial acetic acid, dilute 3 parts of glacial acetic acid with 8 parts of water. 

Platinum trioxide is not acted upon by dilute sulphuric, nitric, or acetic acid. Dilute hydrochloric acid dissolves it with evolution of chlorine, whilst sulphurous acid converts it into complex sulphites. 

Mercuric Acetate Titrant (Caution Mercuric acetate is a strong irritant when ingested or inhaled or upon dermal exposure.) Transfer 3.82 g of mercuric acetate into a 1000-mL volumetric flask containing 950 mL of water. Add 12.2 mL of glacial acetic acid, dilute to volume with water, and mix. Transfer 10.0 mL of this solution into a 100-mL volumet-... 

Acetic Acid Dilute 1 mL of sample to 100 mL with water, transfer 50 mL of this solution into a 250-mL boiling flask, and add 5 g of yellow mercuric oxide. While continuously stirring, boil the mixture under a reflux condenser for 2 h, cool, filter, and wash the residue with about 25 mL of water. Add phenolphthalein TS to the combined filtrate and washings, and titrate with 0.02 N sodium hydroxide. Not more than 2.0 mL of 0.02 N sodium hydroxide is required to produce a pink color. 

Buffer Solution (pH 4.8) Dissolve 164 g of anhydrous sodium acetate in about 500 mL of water, add 120 mL of glacial acetic acid, and adjust the pH to 4.8 with glacial acetic acid. Dilute to 1000 mL with water, and mix. 

N Acetic Acid Dilute 57.5 mL of glacial acetic acid to 500 mL with water. Mix well, and store in a refrigerator. 

Acetate Buffer Solution Dissolve 136 g of sodium acetate (NaC2H302-3H20) in sufficient water to make 500 mL. Mix 25.0 mL of this solution with 50.0 mL of 1 M acetic acid, dilute to 1000 mL with water, and mix. The pH of this solution should be 4.7 0.02. 

Benzidine TS Dissolve 50 mg of benzidine in 10 mL of glacial acetic acid, dilute to 100 mL with water, and mix. 

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