Dictionary, Defintion, Meaning, What is Acetyl Coenzyme A, Acid base Indicator, Acetylacetone, Acetylation, Ethanoylation, Acetyl chlorid, Acetophenone, Acetylene, Black, Cuprene, Acetylacetonate

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Home >> Chemistry Dictionary >>Acetyl Coenzyme A - Acid base Indicator

Your Ad Here	Acetylacetone. C₅H₈O₂, CH₃COCH₂COCH₃. A diketone with enolic properties. The enolate ion acac forms stable complexed with many metals. e.g. tris(acetylacetonate)iron (III). Feacac3. Metal derivatives are generally soluble in organic solvents and appreciably volatile. They are used as solvent extraction and mass spectrometry. Derivatives of acetylacetone, e.g. CF₃COCH₂COCH₃ CF₃COCH₃COCF₃ and thienyl COCH2COCF3 from stable derivatives. Acetylation. Ethanoylation. A process for introducing acetyl groups into an organic compound containing –OH, -NH2 or –SH groups. Acetyl chloride. See ethanoyl chloride.
Acetylcholine, C₇H1₇NO₃. (CH₃)₃N+CH₂OOCCH₃OH-. Passage of a nerve impulse from a nerve end to another nerve or muscle cell causes release of acetylcholine to transmit the impulse across the intercellular space. The acetylcholine is quickly destroyed by the hydrolytic action of acetylcholine esterase. Acetycholin’s injection can cause dilation of the arteries. Acetyl coenzyme. reaction thioester of fundamental importance in metabolism and biosynthesis.
Acetophenone. It is known as Methyl Phenyl Ketone (C₆H₅COCH₃) A colourless crystalline solid (m.p. 293K) obtained by treating benzene, with acetyl chloride, in presence of anhydrous aluminium chloride. It has a pleasing smell, slightly soluble in water. It is used to prepare sleep producing drug (hypnone) and in a perfumery. Acetylene, black, cuprene. A type of carbon black prepared by pyrolysis of ethyne. Acetylides carbides. containing C₂^2- or C₂R^- species. Formed by more electropositive elements and by some transition elements. Hydrolyzed to ethyne. Many transition metal acetylides are explosive.	Your Ad Here
Acetylene complexes. Co-ordination compounds similar to olefin complexes. Achiral. The molecule which is not optically active is achiral. Achromatic indicators. Substance which gives a grey end-point and generally find application in the titration of turbid liquids.
Your Ad Here	Acid. An acid is defined as a substance which is capable of forming hydrogen ions when dissolved in water. Most inorganic acids may be regarded as a compound of an acidic oxide and water; where the oxide concerned is that of a metal, that oxide may exhibit amphoteric character, that is act sometimes as a base. Aqueous solutions of acids have a sharp taste, turn limits red, liberate carbon-di-oxide from a metallic carbonate and give reactions characteristic of the anion present. Acids can also exist in non-aqueous solvents. The concept of acids and bases has been extended to solvents which are ionized and yet do not contain hydrogen: a substance giving the appropriate positive ions is an acid on that system.

Typical organic acids contain the ^-C(O)OH group, but many other acid groupings, e.g. the sulphonic S(O)₂OH give acidic properties to organic compounds. Phenols have acidic properties and are classified with enols as pseudo-acids. The term acid was extended by Lewis to include substances which are electron acceptors. The ‘strength’ of an acid is measured by the value of its dissociation constant, ‘strong’ acids.

Acid-base indicator.
A substance, a weak acid or weak base, which has a different colour in acid or base solution. The colour change is due to a marked different in colour between the undissociated and ionic forms. For a good indicator the colour change must occur between narrow limits of pH, e.g., methyl orange is red at pH 3.1 and changes to yellow at pH 4.4.

Acid dyes.
Dyestuffs containing an aromatic chromophoric group and a group conferring solubility in water generally the SO₃H group as its sodium salt. They are relatively simple in application. The types of acid are:

Simple.
contain no polyvalent metals and are not improved by after treatment with Na₂Cr₂O₇/dil. HCI.

Mordant.
combine simultaneously with the mordanting agent (generally Cr(OH)₃ and the fibre; the dyestuff generally contains ortho OH-azo or OH-OH groups.

Premetallized.
are similar to the simple acid dyes but are already complexed to a metal.

Acid egg.
A non-mechanical pump for the handling of highly corrosive liquids. Liquids is admitted to a corrosion-resistant vessel and forced into the delivery line by compressed air.

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