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Acetic Acid 99% glacial 1lt - Acetic Acid 99% glacial 1lt - Acetic Acid 99%

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Acetic Acid 99% glacial 1lt - Acetic Acid 99% glacial 1lt - Acetic Acid 99%

Acetic Acid 99% glacial 1lt - Acetic Acid 99% glacial 1lt - Acetic Acid 99%
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Acetic Acid 99% glacial 1lt - Acetic Acid 99% glacial 1lt - Acetic Acid 99%
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Acetic Acid 99% glacial 1lt - Acetic Acid 99% glacial 1lt - Acetic Acid 99%
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Acetic Acid 99% glacial 1lt

€14,92 €18,50 με ΦΠΑ

Acetic Acid 99% glacial 1lt

Acetic acid, Ethanoic acid, Vinegar (when dilute); Hydrogen acetate; Methanecarboxylic acid
C2H4O2
M.W: 60.052 g·mol−1
CAS Registry Number: 64-19-7
https://pubchem.ncbi.nlm.nih.gov/compound/Acetic-acid

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SKU: 330327 Categories: Acids, Acids, Chemical Reagents, Chemical Reagents Tags: οξεα, οξυ
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  • Description
Description

Acetic Acid 99% glacial 1lt

Acetic Acid /əˈsiːtɪk/, systematically named ethanoic acid /ˌɛθəˈnoʊɪk/, is an acidic, colourless liquid and organic compound with the chemical formula CH3COOH (also written as CH3CO2H, C2H4O2, or HC2H3O2). Vinegar is at least 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water and other trace elements.

Acetic acid is the second simplest carboxylic acid (after formic acid) and its functional group is methyl. It is an important chemical reagent and industrial chemical, used primarily in the production of cellulose acetate for photographic film, polyvinyl acetate for wood glue, and synthetic fibres and fabrics. In households, diluted acetic acid is often used in descaling agents. In the food industry, acetic acid is controlled by the food additive code E260 as an acidity regulator and as a condiment. In biochemistry, the acetyl group, derived from acetic acid, is fundamental to all forms of life. When bound to coenzyme A, it is central to the metabolism of carbohydrates and fats.

The global demand for acetic acid is about 6.5 million metric tons per year (t/a), of which approximately 1.5 t/a is met by recycling; the remainder is manufactured from methanol.[8] Vinegar is mostly dilute acetic acid, often produced by fermentation and subsequent oxidation of ethanol.

Properties

Acetic Acid 99% glacial 1lt - Acetic Acid 99% glacial 1lt - Acetic Acid 99%

Acetic acid crystals

Acidity

The hydrogen centre in the carboxyl group (−COOH) in carboxylic acids such as acetic acid can separate from the molecule by ionization:

CH3COOH ⇌ CH3CO−2 + H+

Because of this release of the proton (H+), acetic acid has acidic character. Acetic acid is a weak monoprotic acid. In aqueous solution, it has a pKa value of 4.76. Its conjugate base is acetate (CH3COO−). A 1.0 M solution (about the concentration of domestic vinegar) has a pH of 2.4, indicating that merely 0.4% of the acetic acid molecules are dissociated. However, in very dilute (< 10−6 M) solution acetic acid is >90% dissociated.

Acetic Acid 99% glacial 1lt - Acetic Acid 99% glacial 1lt - Acetic Acid 99%

Acetic Acid 99% glacial 1lt - Acetic Acid 99% glacial 1lt - Acetic Acid 99%

Cyclic dimer of acetic acid; dashed green lines represent hydrogen bonds

Structure

In solid acetic acid, the molecules form chains, individual molecules being interconnected by hydrogen bonds. In the vapour at 120 °C (248 °F), dimers can be detected. Dimers also occur in the liquid phase in dilute solutions in non-hydrogen-bonding solvents, and a certain extent in pure acetic acid, but are disrupted by hydrogen-bonding solvents. The dissociation enthalpy of the dimer is estimated at 65.0–66.0 kJ/mol, and the dissociation entropy at 154–157 J mol−1 K−1. Other carboxylic acids engage in similar intermolecular hydrogen bonding interactions.

Uses

Acetic acid is a chemical reagent for the production of chemical compounds. The largest single use of acetic acid is in the production of vinyl acetate monomer, closely followed by acetic anhydride and ester production. The volume of acetic acid used in vinegar is comparatively small.

Vinyl acetate monomer

The primary use of acetic acid is the production of vinyl acetate monomer (VAM). In 2008, this application was estimated to consume a third of the world’s production of acetic acid. The reaction consists of ethylene and acetic acid with oxygen over a palladium catalyst, conducted in the gas phase.

2 H3C−COOH + 2 C2H4 + O2 → 2 H3C−CO−O−CH=CH2 + 2 H2O

Vinyl acetate can be polymerised to polyvinyl acetate or other polymers, which are components in paints and adhesives.

Ester production

The major esters of acetic acid are commonly used as solvents for inks, paints and coatings. The esters include ethyl acetate, n–butyl acetate, isobutyl acetate, and propyl acetate. They are typically produced by catalyzed reaction from acetic acid and the corresponding alcohol:

CH3COO−H + HO−R → CH3COO−R + H2O, R = general alkyl group

For example, acetic acid and ethanol gives ethyl acetate and water.

CH3COO−H + HO−CH2CH3 → CH3COO−CH2CH3 + H2O

Most acetate esters, however, are produced from acetaldehyde using the Tishchenko reaction. In addition, ether acetates are used as solvents for nitrocellulose, acrylic lacquers, varnish removers, and wood stains. First, glycol monoethers are produced from ethylene oxide or propylene oxide with alcohol, which are then esterified with acetic acid. The three major products are ethylene glycol monoethyl ether acetate (EEA), ethylene glycol monobutyl ether acetate (EBA), and propylene glycol monomethyl ether acetate (PMA, more commonly known as PGMEA in semiconductor manufacturing processes, where it is used as a resist solvent). This application consumes about 15% to 20% of worldwide acetic acid. Ether acetates, for example EEA, have been shown to be harmful to human reproduction.

Acetic anhydride

The product of the condensation of two molecules of acetic acid is acetic anhydride. The worldwide production of acetic anhydride is a major application, and uses approximately 25% to 30% of the global production of acetic acid. The main process involves dehydration of acetic acid to give ketene at 700–750 °C. Ketene is thereafter reacted with acetic acid to obtain the anhydride:

CH3CO2H → CH2=C=O + H2O
CH3CO2H + CH2=C=O → (CH3CO)2O

Acetic anhydride is an acetylation agent. As such, its major application is for cellulose acetate, a synthetic textile also used for photographic film. Acetic anhydride is also a reagent for the production of heroin and other compounds.

Use as solvent

Glacial acetic acid is an excellent polar protic solvent, as noted above. It is frequently used as a solvent for recrystallization to purify organic compounds. Acetic acid is used as a solvent in the production of terephthalic acid (TPA), the raw material for polyethylene terephthalate (PET). In 2006, about 20% of acetic acid was used for TPA production.

Acetic acid is often used as a solvent for reactions involving carbocations, such as Friedel-Crafts alkylation. For example, one stage in the commercial manufacture of synthetic camphor involves a Wagner-Meerwein rearrangement of camphene to isobornyl acetate; here acetic acid acts both as a solvent and as a nucleophile to trap the rearranged carbocation.

Glacial acetic acid is used in analytical chemistry for the estimation of weakly alkaline substances such as organic amides. Glacial acetic acid is a much weaker base than water, so the amide behaves as a strong base in this medium. It then can be titrated using a solution in glacial acetic acid of a very strong acid, such as perchloric acid.

Medical use

Acetic acid injection into a tumor has been used to treat cancer since the 1800s.

Acetic acid is used as part of cervical cancer screening in many areas in the developing world. The acid is applied to the cervix and if an area of white appears after about a minute the test is positive.

Acetic acid is an effective antiseptic when used as a 1% solution, with broad spectrum of activity against streptococci, staphylococci, pseudomonas, enterococci and others. It may be used to treat skin infections caused by pseudomonas strains resistant to typical antibiotics.

While diluted acetic acid is used in iontophoresis, no high quality evidence supports this treatment for rotator cuff disease.

As a treatment for otitis externa, it is on the World Health Organization’s List of Essential Medicines.

Foods

Acetic acid has 349 kcal (1,460 kJ) per 100 g. Vinegar is typically no less than 4% acetic acid by mass. Legal limits on acetic acid content vary by jurisdiction. Vinegar is used directly as a condiment, and in the pickling of vegetables and other foods. Table vinegar tends to be more diluted (4% to 8% acetic acid), while commercial food pickling employs solutions that are more concentrated. The proportion of acetic acid used worldwide as vinegar is not as large as commercial uses, but is by far the oldest and best-known application

 

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  • 6484-52-2 Acetic Acid 99% glacial 1lt - Acetic Acid 99% glacial 1lt - Acetic Acid 99%
Chemical formula
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