titration

titration [tī trā′shən]
n.
/span> TITRATE + -ION
Chem. Physiol. the process of finding out how much of a certain substance is contained in a known volume of a solution by measuring volumetrically how much of a standard solution is required to produce a given reaction

* * *

ti·tra·tion (tī-trāʹshən) n.
The process, operation, or method of determining the concentration of a substance in solution by adding to it a standard reagent of known concentration in carefully measured amounts until a reaction of definite and known proportion is completed, as shown by a color change or by electrical measurement, and then calculating the unknown concentration.

* * *

Process of chemical analysis in which the quantity of some constituent of a dissolved sample is determined by adding an exactly measured quantity of another dissolved substance with which it reacts in a definite, known proportion.

The solution of known concentration is gradually added to the unknown solution from a burette (a long measuring tube with a valve at the bottom) until the equivalence point (end point) is reached. The amount of the unknown substance can then be calculated. The equivalence point is determined by a detectable change, for instance, of colour in an indicator substance (e.g., litmus) or in an electrical property. Reactions used in titration include acid-base reactions, precipitations (see solution), formation of complexes, and oxidation-reduction reactions. See also pH.

* * *

▪ chemical process
 process of chemical analysis in which the quantity of some constituent of a sample is determined by adding to the measured sample an exactly known quantity of another substance with which the desired constituent reacts in a definite, known proportion. The process is usually carried out by gradually adding a standard solution (i.e., a solution of known concentration) of titrating reagent, or titrant, from a burette, essentially a long, graduated measuring tube with a stopcock and a delivery tube at its lower end. The addition is stopped when the equivalence point is reached.

      At the equivalence point of a titration, an exactly equivalent amount of titrant has been added to the sample. The experimental point at which the completion of the reaction is marked by some signal is called the end point. This signal can be the colour change of an indicator or a change in some electrical property that is measured during the titration. The difference between the end point and the equivalence point is the titration error, which is kept as small as possible by the proper choice of an end-point signal and a method for detecting it.

      For many titration reactions it is possible to find a suitable visual colour indicator that will signal the end point at, or very close to, the equivalence point. Such titrations, classified according to the nature of the chemical reaction occurring between the sample and titrant, include: acid-base titrations, precipitation titrations, complex-formation titrations, and oxidation-reduction (redox) titrations. In acid-base titration (i.e., the titration of an acid with a base, or vice versa), the indicator is a substance that can exist in two forms, an acid form and a basic form, which differ in colour. For example, litmus is blue in alkaline solution and red in acid solution. phenolphthalein is colourless in acid solution and red in alkaline solution. A wide choice of acid-base indicators is available, varying not only in the colours of the two forms but also in their sensitivity toward acid or base.

      Precipitation titrations may be illustrated by the example of the determination of chloride content of a sample by titration with silver nitrate, which precipitates the chloride in the form of silver chloride. The presence of the first slight excess of silver ion (i.e., the end point) can be marked by the appearance of a coloured precipitate. One way in which this can be done is by employing potassium chromate as indicator. Potassium chromate reacts with the first slight excess silver ion to form a red precipitate of silver chromate. Another method involves the use of an adsorption indicator, the indicator action being based on the formation on the surface of the precipitate of an adsorbed layer of silver indicator salt, which forms only when an excess of silver ion is present.

      The most important titrations based upon complex-formation reactions are those involving the titration of metal ions with the reagent disodium ethylenediaminetetraacetate (a salt of edetic acid, or EDTA). The indicators are dyes that have the property of forming a coloured complex with the metal ion. As the titration proceeds, the reagent reacts first with uncomplexed metal ions, and, finally, at the end point it reacts with the metal-indicator complex. The colour change corresponds to the conversion of the metal-dye complex into the free dye.

      In oxidation-reduction (redox) titrations the indicator action is analogous to the other types of visual colour titrations. In the immediate vicinity of the end point, the indicator undergoes oxidation or reduction, depending upon whether the titrant is an oxidizing agent or a reducing agent. The oxidized and reduced forms of the indicator have distinctly different colours.

      Alternatively, for many titrations the end point can be detected by electrical measurements. These titrations may be classified according to the electrical quantity that is measured. Potentiometric titrations involve the measurement of the potential difference between two electrodes of a cell; conductometric titrations, the electrical conductance or resistance; amperometric titrations, the electric current passing during the course of the titration; and coulometric titrations, the total quantity of electricity passed during the titration. In the four titrations just mentioned, except coulometric titrations, the end point is indicated by a marked change in the electrical quantity that is being measured. In coulometric titrations, the quantity of electricity required to carry out a known reaction is measured, and from Faraday's law the quantity of material present is calculated.

* * *


Universalium. 2010.

Look at other dictionaries:

  • Titration — Ti*tra tion, n. (Chem.) The act or process of titrating; a substance obtained by titrating. [1913 Webster] …   The Collaborative International Dictionary of English

  • titration — 1864, from Fr. titrer, from titre standard, title (see TITLE (Cf. title)), also fineness of alloyed gold; in chemistry, the establishment of a standard strength or degree of concentration of a solution …   Etymology dictionary

  • titration — [tī trā′shən] n. [< TITRATE + ION] Chem. Physiol. the process of finding out how much of a certain substance is contained in a known volume of a solution by measuring volumetrically how much of a standard solution is required to produce a… …   English World dictionary

  • Titration — [ frame|Titration setup: the titrant drops from the burette into the analyte solution in the flask. An indicator present then changes color permanently at the endpoint.] Titration is a common laboratory method of quantitative chemical analysis… …   Wikipedia

  • Titration — allgemeiner Versuchsaufbau: oben: Bürette mit Maßlösung, unten: Erlenmeyerkolben (besser Titrierkolben) mit Probelösung Die Titration (Titrimetrie, Volumetrie oder auch Maßanalyse) ist ein Verfahren der quantitativen Analyse in der Chemie. Ein… …   Deutsch Wikipedia

  • Titration — titravimas statusas T sritis Standartizacija ir metrologija apibrėžtis Reagento tirpalo pylimas iš biuretės į analizuojamąjį tirpalą, kol pasiekiamas lygiavertiškumo taškas. atitikmenys: angl. titration vok. Titration, f; Titrieren, n; Titrierung …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Titration — Ti|tra|ti|on auch: Tit|ra|ti|on 〈f. 20〉 Bestimmung des Titers * * * Ti|t|ra|ti|on; Syn.: Titrieren: die Ausführung einer ↑ Maßanalyse durch kontinuierliches Zufließenlassen der Maßlösung aus einer Bürette in die vorgelegte Testlösung, bis der… …   Universal-Lexikon

  • titration — titravimas statusas T sritis chemija apibrėžtis Reagento tirpalo pylimas iš biuretės į analizuojamąjį tirpalą, kol pasiekiamas ekvivalentinis taškas. atitikmenys: angl. titration rus. титрование …   Chemijos terminų aiškinamasis žodynas

  • titration — titrate ► VERB Chemistry ▪ ascertain the amount of a substance in (a solution) by measuring the volume of a standard reagent required to react with it. DERIVATIVES titration noun. ORIGIN from French titre «fineness of alloyed gold or silver» …   English terms dictionary

  • titration — noun Date: circa 1859 a method or the process of determining the concentration of a dissolved substance in terms of the smallest amount of a reagent of known concentration required to bring about a given effect in reaction with a known volume of… …   New Collegiate Dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.