Types of Reaction in Titrimetry

The reactions employed in titrimetric analysis may be broadly divided into two main classes. 

For simplicity and convenience the above two broad categories is subdivided into four main classes  

The two terms are complementary. They involve determination of strength of acid or an alkali solution by titration against a standard solution of alkali or an acid as the case may be. If the strengths in normality of the alkali and the acid solutions are and Sg respectively and ml of the alkah exactly neutralises VB ml of the acid then  

This is the fimdamental equation of acidimetry-alkalimetry. If the strength of one is known, the other can be calculated out. 

These depend upon the combination of ions other than hydrogen or hydroxide ions, to form a soluble slightly dissociated ion or compound. Ethylene diamine tetra acetic acid, mostly as the disodium salt EDTA, is a very important reagent for complex formation. The use of metal ion-indicators has highly enhanced its importance in titrimetry. The subject is discussed in section of calcium and magnesium estimation by EDTA. 

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