Mohr usually obtains about an ounce and a half of benzoic acid from twelve ounces of gum benzoin by the first sublimation.
When benzoic acid is prepared by any of the wet processes, it is free from the fragrant volatile oil which accompanies it when prepared by sublimation from the resin, and to which oil the acid of commerce owes its peculiar odor.
When the ether ceases to pass over, the hot water in the retort is filtered, which deposits benzoic acid on cooling.
Gregory considers the following process for obtaining benzoic acid the most productive.
As the gum is not exhausted by the first operation, it may be bruised when cold and again submitted to the action of heat, when a fresh portion of benzoic acid will sublime from it.
Some of the largest wholesale perfumers use five or six pounds of gum benzoin per annum, but none use the benzoic acid.
This story is founded on the fact that Benzoic acid can be obtained from the draining of stables, and that Benzoic acid has rather a pleasant odor.
When hydrochloric acid is added to a cold concentrated solution of the salts of benzoic acid, it is precipitated as a white powder.
Benzoic acid has been found of service in allaying the irritation.
By sublimation from the dry aqueous extract of nut-galls, in a Mohr's apparatus, in the same way that benzoic acid is obtained from benzoin resin, observing the precautions referred to in No.
Divide into 350 lozenges, and finish as benzoic acid lozenges.
Unfortunately, the purified essence does not keep well, and is often converted after a few months into little else than a solution of benzoic acid, almost devoid of the usual odour and flavour of the bitter almond.
Succinic acid is distinguished from benzoic acid by its greater solubility, and by giving a brownish or pale red bulky precipitate with ferric chloride in neutral solutions; whereas that with benzoic acid is paler and yellower.
Suspend the benzoic acid in 10 parts of water, add the lithium carbonate, and heat.
Exposed to the air, it greedily absorbs oxygen, and becomes converted into a mass of crystallised benzoic acid.
Dilute acids convert it into benzoic acid, grape sugar, and saliretin; and with a mixture of sulphuric acid and bichromate of potassa it yields a large quantity of salicylous acid.
Divide into 350 lozenges, and finish as with benzoic acid lozenges.
Depsides produced in this manner are by no means new, and were obtained by Klepl by simply heating p-hydroxy-benzoic acid (cf.
To some extent benzoic acid and benzoates have taken the place of salicylic acid and salicylates, partly because salicylic acid can readily be detected analytically, while benzoic acid is not quite easily discoverable.
B, Luff obtained apoaconitine, aconine and benzoic acid by hydrolysis; while, in 1802, C.
An antiseptic with a pronounced taste is obviously a safer one in the hands of a nonmedical person than one virtually devoid of taste, like boric, salicylic or benzoic acids or their salts.
H2O which is probably an oxy-methoxy-benzoyl benzoic acid.
This was first proved experimentally by Alexejeff[205] in the case of benzoic acid and water, the solubility curves for which are given in Fig.
Distil and the benzoic acid will pass over, extract the distillate in the usual way and apply the above test to it for benzoic acid.
The residue may contain salicylic acid, benzoic acid, or saccharin.
If a bright cherry-red color forms where the two liquids meet, either benzoic acid or saccharin is present.
The chemicals used as preservatives are sulfurous acid, and the sulfites, salicylic acid and saccharin, benzoic acid, and sometimes formaldehyde.
Confirm its presence by neutralizing the aqueous solution of the extracted benzoic acid with sodium hydroxid; concentrate to a very small volume.
If a red color appears immediately on the surface, it shows the presence of benzoic acid.
Add a drop of ferric chlorid solution, and ifbenzoic acid is present a characteristic flesh or brownish colored precipitate of ferric benzoate forms.
Heated with lime, very distinct odors ofbenzoic aldehyde are developed.
These crystals, except for a slight sweetness of taste, correspond in characters and tests to benzoic acid.
Benzoic acid they regarded as a compound of the same radicle with another radicle, consisting of equal numbers of oxygen and hydrogen atoms.
At that time it was known that benzoic acid is formed by exposure of bitter-almond oil to the air.
The medical chemists of the sixteenth century dealt much with substances derived from plants and animals, such as benzoic and succinic acids, spirit of wine, oils, etc.
Footnote A: It may be prepared chemically pure by distilling a mixture of benzoic acid and lime.
By this means the first compound is transformed into benzoic aldehyde, and the second into benzoic acid.
Benzoic acid, like the aldehyde, is a natural product which has long been known.
In 1834 the same hydrocarbon was obtained by Mitscherlich by heatingbenzoic acid with lime, and by Peligot by the dry distillation of calcium benzoate.
By distilling a mixture of the dry lime salts of benzoic and acetic acids there is obtained a compound known to chemists as acetophenone, which is used for inducing sleep under the name of hypnone.
It is related to benzoic acid in the same way that diamidobenzene is related to aniline.
A mixture of vanillin and benzoic aldehyde when attenuated to a state of extreme dilution in a spirituous solvent, gives the perfume known as "heliotrope.
Resorcinol is a phenolic derivative of benzene containing two hydroxyl groups; it is therefore related to phenol in the same way that diamidobenzene is related to aniline or phthalic acid to benzoic acid.
The action between benzoic aldehyde and other bases analogous to dimethylaniline was found to be quite general, and the principle was extended to diethylaniline and similarly constituted bases.
Benzoic aldehyde or bitter-almond oil is one of the oldest known products of the vegetable kingdom, and has from time to time been made the subject of investigation by chemists since the beginning of the century.
Niobe oil, or ethyl benzoate, the ester obtained from ethyl alcohol and benzoic acid, and having the specific gravity at 15° C.
The oil consists chiefly of benzyl benzoate and cinnamate, together with styracin, or cinnamyl cinnamate, and a small quantity of free benzoic and cinnamic acids.
It has a strong characteristic odour, and occurs, associated with traces of benzoic acid and heliotropin, in the vanilla bean.
Although these substances are much more highly poisonous than chemical preservatives like benzoic acid, over which much concern has been expressed, but little if any objection has been made to the use of smoked foods.
Probably the evidence respecting the effect of benzoic acids and the benzoates when used as food preservatives constitutes as favorable a case as can be made out at the present time for the employment of any chemical substance.
It suggests that even the small quantities of benzoic acid which we get with unadulterated food, or produce within ourselves, might be deleterious to health except for the saving hippuric acid forming process.
Perhaps the final solution of the benzoic acid problem could be best obtained directly from the people at large.
Benzoic acid is present in noteworthy amounts in many fruits and berries, especially cranberries, and its presence in these natural foods has never been connected with any injurious action.
The use of benzoic acid (benzoate of soda) as a food preservative illustrates several phases of the controversy.
The very fact that we are in possession of an efficient process for converting poisonous benzoic acid into harmless hippuric acid indicates that there is a necessity for doing so.
But we ought to be exceedingly cautious about accepting any definite figure, certainly any large figure, as representing the permissible amount of added benzoic acid in our food.
And because that "factor of safety" is a large one with respect to the normal benzoic acid content of our food it does not follow that we can encroach on it with perfect impunity.
In my opinion this point of view is going to prevail, and the strife will resolve itself into a controversy over how much benzoic acid shall be permitted to go into our daily food.
The preparation contained benzoate, both in the form of free benzoic acid and also in the form of a water-soluble salt probably sodium benzoate.
Benzoic acid, which is innocuous to animals, seems to be as poisonous to Drosera as hydrocyanic.
Wooden stand, with hole to carry the cup C, containing the benzoic acid, heated below by the spirit-lamp, S.
The benzoic acid should first be sublimed over the sprigs or artificial flowers in a gas jar, which may be removed when the whole is cold, and a clear glass shade substituted for it.
Of, pertaining to, or derived from, thiophene; specifically, designating a certain acid analogous to benzoic acid.
A nitrogenous organic base obtained by the oxidation of amarine, and regarded as a derivative of benzoic aldehyde.
CO2H, which are related to toluene and analogous to benzoic acids.
It is also produced from certain derivatives of benzoic acid, and is one important source of artificial indigo.
By the action of acids, it is decomposed into benzoicacid and glycocoll.
Defn: A nitrogenous organic base obtained by the oxidation of amarine, and regarded as a derivative of benzoic aldehyde.
CO2H, which are related to toluene and analogous to benzoic acids.
CO2H)2, analogous to benzoic acid, and employed in the brilliant dyestuffs called the phthaleins.
If it is found to contain sufficientbenzoic acid to react with a considerable proportion of the sodium alcoholate, a poor yield of ester will be obtained.
The reaction mixture is not treated with acetic acid, as usually recommended, for the reason that such a procedure yields a final product contaminated with benzoic acid, unless an alkaline wash is applied subsequently.
Other Methods of Preparation The nitration of benzoic acid produces only very small yields of the p-nitro product.
Petroleum-ether and benzine withdraw only benzoic acid from the dry, powdered benzoin.
Benzoic acid separated by the wet method is odorless.
By extracting such mixture with thin sodium carbonate solution, benzoic acid passes into solution.
In Tolu balsam have been found toluene, cinnamic and benzoic acids, and several resins not yet sufficiently examined.
By oxidizing substances it is converted into bitter almond oil and benzoic acid, and by the action of potassium hydroxide it is decomposed to cinnyl alcohol and cinnamic acid.
The content of cinnamic and benzoic acids amounts to from 12 to 20 per cent.
In the air it is rapidly converted into benzoicacid by the absorption of oxygen.
The best varieties from Sumatra and Singapore contain nobenzoic acid, and those from Siam no cinnamic acid.
Such an adulteration can be detected with the microscope, since vanillin crystallizes in acicular crystals, and benzoic acid in lamina, which can be readily recognized.
The potash solution separated from the Peru balsam oil, contains cinnamic acid, benzoic acid, and resin.
The benzoic acid is thereby gradually and completely converted into ether.
It stands in the same relation to cinnamic acid as benzol to benzoic acid, and is formed by distilling a mixture of cinnamic acid and barium oxide.
All varieties of benzoin dissolve in concentrated sulphuric acid to a beautiful purple colored fluid, from which benzoic acid, if present, is separated in crystals by the gradual addition of water.
The distillate "B" may contain formic, acetic, propionic, butyric andbenzoic acids.
Buff precipitate = benzoic acid, and other acids related to benzoic acid.
The national government in 1906 passed what is known as the Pure Food Law, which makes it illegal to use any of these preservatives (excepting benzoic acid in very small amounts).
Of the former, salt and sugar are examples; of the latter, formaldehyde and possiblybenzoic acid.
It consists largely of resin, and yields benzoic acid.
The sweet perfume is due chiefly tobenzoic acid, such as is used for making scented pastilles, or Ribbon of Bruges for fumigation.
About this time the patient took three grains of benzoic acid, in the form of pill thrice a day, and it was thought, with the advantage of slightly diminishing the jaundiced state of the skin.
At the same time three grains of benzoic acid were ordered to be taken thrice a-day.
This gentleman, under the influence of benzoic acid, perfectly recovered his normal complexion in the short space of a week.
The latter change was expedited by {119} the administration of benzoic acid, and in a week from my first visit, a stranger would have been quite unable to detect that the patient had laboured under a recent attack of jaundice.
On one occasion I tried benzoic acid in a case of jaundice following upon an attack of ague; but it proved of no service.
In this case no medicine whatever, except the benzoic acid, was given.
There is a remedy to which I wish to call special attention, namely, benzoic acid.
It is highly probable, as Woehler has remarked, that cocain may yet be artificially made by a mixture of hygrin with Benzoic acid, or rather with one of the substances forming part of the Benzoyle group.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "benzoic" in a variety of sentences. We hope that you will now be able to make sentences using this word.
