Precipitation titrimetry is rarely listed as a standard method of analysis, but may still be useful as a secondary analytical method for verifying results obtained by other methods. Most precipitation titrations involve Ag+ as either an analyte or titrant.
Those titrations in which Ag+ is the titrant are called argentometric titra- tions. Table 9.22 provides a list of several typical precipitation titrations.
The stoichiometry of a precipitation reaction is given by the conservation of charge between the titrant and analyte; thus
Example 9.17 shows how this equation is applied to an analysis based on a direct titration.
The analysis for I– using the Volhard method requires a back titration. A typical calculation is shown in the following example.
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