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Acetate - Definition, Structure, Properties, Fermentation

Acetate is formed by the loss of one H-atom of the -OH group of acetic acid. The formula of acetate is CH3COO–. Its molecular structure has a methyl group linked to a carboxylate group. In this article, you will learn about the acetate ion in detail, including its structure formula, properties, reactions, and uses.

Table of Content

What is Acetate?

Acetate is a chemical compound derived from acetic acid. It is formed when acetic acid loses a hydrogen atom. This formation creates a negative charge. Its formula is represented as CH3COO– or C2H3O2–, indicating its ionic nature.

The compound can exist in the form of a salt or ester. It plays a major role in biological and chemical applications. It is commonly found as part of vinegar, where it exists as acetic acid. Acetate is versatile, and used in industry, food, and medicine.

Acetate Structure

Acetate has one methyl group (-CH3) in its structure, which is bonded with a carbonyl carbon. The carbonyl group is connected to another oxygen with a negative charge along with the methyl group.

Acetate-Structure

The central carbon atom in acetate is sp2 hybridized. This involves the mixing of one s-orbital and two p-orbitals. It results in three sp2 hybrid orbitals that form a trigonal planar structure. The oxygen atoms are also sp2 hybridized. Each oxygen uses one sp2 orbital to form a sigma bond with the central carbon.

One oxygen atom forms a double bond with the central carbon through a p orbital overlap, creating a pi bond. This pi bond is part of what gives acetate its resonance stability. The double bond between the carbon and one oxygen can switch to the other oxygen atom. This movement creates two resonance structures. This contributes to the overall stability of the acetate ion.

The delocalization of electrons across the oxygen atoms reduces electron density on any one atom. This structural feature allows acetate to react readily with positive ions and form stable compounds.

Fermentation of Acetate

Fermentation of acetate involves the breakdown of organic compounds by microorganisms like bacteria and yeast. This process is anaerobic. Acetate fermentation is mostly seen in the production of ethanol, where sugars like glucose are converted into alcohol and carbon dioxide. However, under certain conditions, the pathway can continue, converting ethanol into acetate.

The chemical reaction for the fermentation of acetate involves the oxidation of ethanol by acetic acid bacteria. The reaction can be represented as follows:

C2H5OH + O2 → CH3COOH + H2O

Physical Properties of Acetate

The following table lists the physical properties of acetate:

Property Description
State Typically a white, crystalline solid
Solubility Soluble in water
Taste Distinctively sour
Melting Point High melting point (varies by specific salt)
Boiling Point Boiling points vary (higher for esters)
Density Density varies depending on the form
Odor Esters have pleasant, often fruity odors
Volatility Esters like ethyl acetate are highly volatile
Optical Clarity Clear and glossy in solid forms

Chemical Properties of Acetate

The chemical properties of acetate are discussed below:

Acetate reacts with sodium hydroxide

When acetate reacts with sodium hydroxide (NaOH), it undergoes a neutralization reaction, which is a typical acid-base interaction. The chemical equation for this reaction is:

CH3​COO− + Na++ OH− → CH3COONa + H2​O

In this reaction, the acetate ion (CH3COO−) acts as a base and accepts a proton (H+) from the hydroxide ion (OH−), resulting in the formation of water (H2​O) and sodium acetate (CH3COONa). This demonstrates the basic nature of the acetate ion, capable of neutralizing an acid component such as OH−.

Acetate reacts with Water

In water, the interaction of acetate is a classic example of a hydrolysis reaction, though it is somewhat weak and highly dependent on the pH of the solution. The reaction can be represented as:

CH3COO− + H2O ↔ CH3COOH + OH−

The acetate ion (CH3COO−) reacts with water to form acetic acid (CH3COOH) and hydroxide ions (OH−). This reaction is reversible and shows how acetate can help in maintaining chemical equilibrium.

Uses of Acetate

Some of the most common applications of Acetate are :

  • Acetate is used as the base material for photographic film and tapes. It provides a flexible and durable medium that is less flammable than the previously used nitrate film.
  • Acetate is used in packaging due to its clarity and gloss. It offers good resistance to oils, greases, and other chemicals. This makes it ideal for protecting and displaying food products.
  • It forms part of many medicinal formulations. It is used to adjust the pH of medications and as an electrolyte in hydration solutions. Acetate buffers help maintain the body’s acid-base balance in medical treatments.
  • Acetate is commonly used in chemical labs as a buffer solution. It helps maintain a stable pH during chemical reactions, which is critical for many experimental procedures.
  • Acetate is used in environmental technology. It helps in the biodegradation of pollutants. Its role in microbial metabolism helps in breaking down hazardous substances in soil and water.

Also, Check

FAQs on Acetate

What is acetate used for?

Acetate is used in textiles, food preservation, pharmaceuticals, photography, and as a solvent in paints and coatings.

Is acetate soluble in water?

Yes, acetate is soluble in water, which allows it to be used in various aqueous solutions and applications.

What does acetate taste like?

Acetate typically has a sour taste, which is noticeable in diluted acetic acid, such as vinegar.

What are the physical properties of acetate?

Acetate is a white, crystalline solid with a high melting point, soluble in water, and often has a sour taste and pleasant odor in ester form.

How is acetate produced?

Acetate is produced through the fermentation of ethanol by acetic acid bacteria, chemical synthesis from acetic acid, or by the esterification of acetic acid with alcohols.

What is the melting point of acetate?

The melting point of acetate varies depending on the specific type of acetate salt; however, it generally has a high melting point.

What is the difference between acetate and acetic acid?

Acetic acid is an organic acid (CH3COOH), while acetate (CH3COO-) is its conjugate base, typically found as part of a salt or ester.


 


Reffered: https://www.geeksforgeeks.org

School Chemistry

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