Senin, 05 November 2012


Acid and Bases Organic 

      Organic acids
Organic acids are organic compounds that have a degree of acidity. The most common organic acids are the alkanoic acid having acidity with carboxyl-COOH, and sulfonic acid group-SO2OH the acidity has a relatively stronger. Stability is very important to the acid groups and determine the degree of acidity an organic compound.
Compounds called carboxylic acids, has a-COOH group, are very much in living organisms and is involved in metabolic reaction pathways. Acetic acid, pyruvic acid, and citric acid is an example. It should be noted that the physiological pH is about 7.3, so the carboxylic acids are mostly found as the anion, the carboxylate anion,-COO-.
Esters can be synthesized by the reaction of carboxylic acid and alcohol-assisted acid catalyst. This reaction can be called esterification, the reaction takes place reverrsible general:
RCOOH + 'R OH R + H2O COO'R
In chemical compounds, esters are one of the organic compounds that are formed through pergatian one or more hydrogen atoms in hydroxyl groups with an organic group (usually denoted by 'R). Oxygen is an amino acid whose molecule has a hydrogen _OH group can dissociate into H +.
In karbosilat acid OH group is replaced with alcohol groups by reacting carboxylic acids and alcohols in acidic conditions. This reaction is a reversible reaction.
R COOH + 'R OH + H2O RCOO'R

1) pyruvic acid (CH3COCO2H) is an alpha-keto acid which has an important role in biochemical processes. Carboxylate anion of pyruvic acid called pyruvate.
Pyruvic acid is a colorless liquid with an odor similar to acetic acid. Pyruvic acid mixed with water, and soluble in ethanol and diethyl ether. In the laboratory, pyruvic acid is made by heating a mixture of tartaric acid with potassium bisulfate, or by hydrolysis of acetyl cyanide, which is made by reaction of acetyl chloride and potassium cyanide.
Pyruvate is an important chemical compound in biochemistry. This compound is the metabolism of glucose is called glycolysis. A glucose molecule is split into two molecules of pyruvic acid, which is then used to generate energy. If there is enough oxygen, the pyruvic acid is converted to acetyl-CoA, which is then processed in the Krebs cycle. Pyruvate can also be converted into oxaloacetate by reaction anaploretik were then broken down into molecules of carbon dioxide. Cycle name is taken from the biochemist Hans Adolf Krebs, winner of the 1953 Nobel Prize in Physiology, as he managed to identify the cycle).
If there is not enough oxygen, pyruvic acid is broken down anaerobically, producing lactic acid in animals and humans, or ethanol in plants. Pyruvate is converted into lactate using the enzyme lactate dehydrogenase and the coenzyme NADH through lactate fermentation, or to acetaldehyde and then ethanol through fermentation alcohol.
Pyruvic acid can also be converted to carbohydrates via gluconeogenesis, to fatty acids or energy through acetyl-CoA, to the amino acid alanine and to ethanol. Pyruvic acid derivatives, 3-bromopiruvat been studied for the treatment of cancer.

2) acetic acid, ethanoic acid or acetic acid is an organic acid chemical compounds known as sour flavoring and aroma in food. Acetic acid has the empirical formula C2H4O2. This formula is often written in the form of CH3-COOH, CH3COOH, or CH3CO2H. Pure acetic acid (called glacial acetic acid) is a colorless hygroscopic liquid, and has a freezing point of 16.7 ° C.
Acetic acid is one of the simplest carboxylic acids, as formic acid. Solution of acetic acid in water is a weak acid, meaning that only partially dissociate into H + and CH3COO-. Acetic acid is a chemical reagent and industrial raw materials is important. Acetic acid is used in the production of polymers such as polyethylene terephthalate, cellulose acetate and polyvinyl acetate, as well as a wide range of fibers and fabrics. In the food industry, acetic acid is used as an acidity regulator. In households, diluted acetic acid is often used as a water softener. Within a year, world demand for acetic acid to 6.5 million tons per year. 1.5 million tons per year generated from the recycling, the remainder derived from the petrochemical industry as well as from biological sources.
Acetic acid is a trivial name or trade name of this compound, and is the name most recommended by IUPAC. The name is derived from the Latin word acetum, meaning vinegar. Systematic name of this compound is ethanoic acid. Glacial acetic acid is a trivial name that refers to acetic acid which is not mixed with water. So called because water-free acetic acid forms crystals resemble ice at 16.7 ° C, slightly below room temperature.
The most commonly used abbreviations and acronyms merupakat official for acetic acid is AcOH or HOAc where Ac means an acetyl group, CH3-C (= O) -. In the context of acid-base, acetic acid is often abbreviated HAC, though many feel that the abbreviation is not true. Ac also not be confused with the symbol of the element actinium (Ac).

Organic Bases 
Organic base is characterized by the presence of atoms with a lone pair of electrons that can bind protons. Compounds containing nitrogen atom is an example of an organic base, but the oxygen-containing compounds can also act as a base when reacted with a strong acid. It should be noted that compounds containing oxygen atoms can act as an acid or alkaline, depending on the environment. As acetone and methyl alcohol can act as an acid when it donates a proton, but as a base while receiving oxygen atom proton

The organic acid is a carboxylic acid group and is an organic base is an amine compound group.
- Amina Bases
    Amine compounds characterized by amino functional group (-NH3). Amine compounds can be considered as a derivative of ammonia by replacing one, two, or three hydrogen from ammonia by organic groups. Based on the amine group distinguished on carbon aliphatic amines when bound to aliphatic carbon, for example CH3-CH2-NH2 (ethyl amine), and aromatic amines if carbon is carbon aromatic group.
- Carboxylic Acid
    Carboxylic acids are organic acids characterized by the carboxyl functional groups formed through the combination of a carbonyl group with a hydroxyl group in a carbon trail.
Carboxylic acid derivatives are esters, carboxylic acid anhydrides, and amides.

4 komentar:

  1. based on the article,
    When acid reacts with an alcohol in the ester formation, in this case the release of H atoms from alcohol. I want to ask is why are released in this reaction is the H atom of the alcohol? why no H atom of the acid?

    BalasHapus
    Balasan
    1. i will try to answer .In chemistry, esters are organic compounds with the symbols R 'which replaces a hydrogen atom or more. Acid esters are also formed with irregular unorganized, as an example, dimethyl sulfate which is also called "sulfuric acid, dimethyl ester" A solidification reaction to form an ester is called esterification. Esterification can be catalyzed by the presence of ¬ H + ions into which there may be a tendency of properties owned by the alcohol to remove the H atom in the formation of esters.

      Hapus
  2. The formation can be seen in the reaction of carboxylic acid esters of the reaction.
    Alcohol + As.Karboksilat
    CH3COOH C2H5OH + --------> H2O + CH3COOC2H5
    terion that means alcohol into H + and CH3COO-and carboxylic acids into C2H5 + and OH-
    so the H atom is removed by alcohol. here because alcohol is more easily remove the hydrogen

    BalasHapus
  3. Esters can be hydrolysed with acid to form the influence of alcohol, a process called esterification can be catalyzed by the presence of H + ion atom where there may be a tendency of properties owned by the alcohol to remove the H atoms in the formation of esters, carboxylic ester is derived compounds in which one H atom in the COOH replaced the alkyl group (-R) or aryl (-Ar)

    BalasHapus