Platinum in a very fine state of divisionknown as platinum black, or noir de platinehas the very singular property of causing alcohol to change into acetic acid with great rapidity.

PROPERTIES OF THE ONION.The onion is possessed of a white, acrid, volatile oil, holding sulphur in solution, albumen, a good deal of uncrystallizable sugar and mucilage; phosphoric acid, both free and combined with lime; acetic acid, citrate of lime, and lignine.

To the solution of mineral matters obtained from Experiment 3, add acetate of soda until free acetic acid is present, recognized by the smell (like dilute vinegar); then add oxalate of ammonia.

Boil a small portion of the albumen solution in a test tube, adding drop by drop dilute acetic acid (two per cent) until a flaky coagulum of insoluble albumen separates.

Add cautiously dilute acetic acid until there is a copious, granular-looking precipitate of the chief proteid of milk (caseinogen), formerly regarded as a derived albumen.

Place some milk in a basin; heat it to about 100 degrees F., and add a few drops of acetic acid.

Filter A, and carefully neutralize the filtrate with very dilute hydrochloric or acetic acid, equal to a precipitate of alkali-albumen.

It is best to precipitate the mucin by acetic acid before making experiments; and to dilute the clear liquid with a little distilled water.

(Magnified to the same scale.) A, from proteus, a kind of newt; B, salamander; C, frog; D, frog after addition of acetic acid, showing the central nucleus; E, bird; F, camel; G, fish; H, crab or other invertebrate animal ]

Prepare a strong solution of sulphate of quinine with the aid of a little sulphuric acid to dissolve it (bitter), a five-per-cent solution of sugar (sweet), a ten-per-cent solution of common salt (saline), and a one-per-cent solution of acetic acid (acid).

Allow a drop of dilute acetic acid to run under the cover glass; the filaments will swell and become transparent.

Sourness N. sourness &c adj.; acid, acidity, low pH; acetous fermentation, lactic fermentation. vinegar, verjuice^, crab, alum; acetic acid, lactic acid.

Adj. sour; acid, acidulous, acidulated; tart, crabbed; acetous, acetose^; acerb, acetic; sour as vinegar, sourish, acescent^, subacid [Chem]; styptic, hard, rough.

Some kinds of bark-summac, logwood, etc.,-are sufficient to remove the scale from water charged with magnesia or carbonate of lime, but they are injurious to the iron owing to the tannic acid with which they are charged. Vinegar, rotten apples, slop, etc., owing to their containing acetic acid, will remove scale, but this is even more injurious to the iron than the barks.

The vapors of acetic acid that are disengaged enter the boiler, C, through the tube, d, and are kept hot by the steam.

In the head, D, they are separated into two portions, viz., into concentrated acetic acid, which condenses by reason of its high boiling point, and into steam, which distills and carries along but a very small amount of acetic acid.

In the head, D, they are separated into two portions, viz., into concentrated acetic acid, which condenses by reason of its high boiling point, and into steam, which distills and carries along but a very small amount of acetic acid.

The acetic acid that accumulates in the boiler, C, must be again vaporized and treated until it no longer gives off any steam at all through the pipe, G.

As soon as the steam can no longer be separated in the boiler, C, and temperature has reached 118 degrees, the anhydrous acetic acid is distilled through the tube, g, and received in the cooler, K, wherein it condenses.

After this, steam is injected directly through the tube, k, in order to distill the acetic acid that still remains in the residuum, and which passes thus through the tube, e, into the worm, h, and flows into the two-necked bottle, S. There may be added to the boiler, C, certain materials for purifying the acetic acid, such as permanganate of potassa or acetate of soda, so as to obtain an absolutely pure article.

After this, steam is injected directly through the tube, k, in order to distill the acetic acid that still remains in the residuum, and which passes thus through the tube, e, into the worm, h, and flows into the two-necked bottle, S. There may be added to the boiler, C, certain materials for purifying the acetic acid, such as permanganate of potassa or acetate of soda, so as to obtain an absolutely pure article.

If this fermentation continues long enough, the acetous fermentation is set up, and acetic acid, the essential element of vinegar, is formed and the dough becomes sour.

Absorption 38 Acetic acid 119 Acetic fermentation 119 Acorn coffee 433 A fourteenth century recipe

Absorption 38 Acetic acid 119 Acetic fermentation 119 Acorn coffee 433 A fourteenth century recipe

In charring it a considerable quantity of acetic acid is extracted, which is of great value for the purpose of bleaching, &c. &c. 109.