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Chapter: Modern Analytical Chemistry: Titrimetric Methods of Analysis

Precipitation Titrations

Thus far we have examined titrimetric methods based on acid–base, complexation, and redox reactions.

Precipitation Titrations

Thus far we have examined titrimetric methods based on acid–base, complexation, and redox reactions. A reaction in which the analyte and titrant form an insoluble precipitate also can form the basis for a titration. We call this type of titration a pre- cipitation titration.

One of the earliest precipitation titrations, developed at the end of the eigh- teenth century, was for the analysis of K2CO3 and K2SO4 in potash. Calcium nitrate, Ca(NO3)2, was used as a titrant, forming a precipitate of CaCO3 and CaSO4. The end point was signaled by noting when the addition of titrant ceased to generate ad- ditional precipitate. The importance of precipitation titrimetry as an analytical method reached its zenith in the nineteenth century when several methods were de- veloped for determining Ag+ and halide ions.

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