The acid-base titrations, redox titration, and complexometric titrations are the types of volumetric titration in which the concentration of a solute is found out by volume determination.
Titration is a type of quantitative chemical analysis used to determine the concentration of the analyte. It is also called titrimetry in the context of volumetric analysis since volume measurement is significant in titration. The titrant is added to a burette until the reaction is complete, the equivalence point or endpoint is usually indicated with an indication. Acid-base, complexometric, precipitation, and redox titrations are 4 different types of titration based on different techniques and purposes.
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Volumetric analysis is a broadly used analytical method that includes calculating the volume of a specified concentration solution and is used to determine the concentration of the compound. In a volumetric titration, a titrant is applied to an unknown concentration with an indicator that will mark the time at which all compounds have reacted. Volumetric analysis is known called titrimetric analysis, as all experiments are done by titration reactions under this type of analysis. Depending on the nature of the reaction, the volumetric analysis can be classified into three techniques which are acid-base titrations, redox titrations, and complexometric titration.
Types of volumetric titration method:
Acid-base reactions, complexometric reactions, and redox reactions are some of the most typical volumetric analysis applications which involve the analysis of a certain volume of an unknown sample with a known solution.
Acid-Base titration:
In this type of titration, the reaction of an acid and a base is involved. By adding a solution of standard base, the estimated value of acid in a sample solution can be determined (or vice-versa). The strong acid-strong base, weak acid-strong base, strong acid-weak base, weak acid-weak base are the types of acid-base titration in which indicators are selected based on the type of titration and pH range. Commonly used indicators in the acid-base are phenolphthalein and methyl orange.
Complexometric titration:
This type of volumetric analysis involves the formation of a colored complex to indicate the endpoint of a titration. It is very effective for determining the concentration of different metal ions in the sample solution. Back titration, direct titration, replacement titration, and indirect titration are the forms of complexometric titration, in which the Eriochrome Black T indicator is most commonly used.
Redox titration:
In this type of volumetric titration, a redox reaction between an analyte and a titrant is involved. Iodimetry, cerimetry, permanganometry, bromatometry, and dichrometry are some of the most common redox reactions. They are based on the oxidation-reduction process between the analyte and the titrant. A redox indicator (e.g. phenanthroline) or potentiometer is commonly used for redox titration.
In volumetric analysis, the precision of results is dependent on the use of accurate apparatus or glassware, such as volumetric flasks, burettes, and pipettes, all of which must be calibrated. The exact weight of the substance is another important factor in obtaining accurate results. To learn about the basic principle of volumetric titration search our blog.
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