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argentometry
Sign in to saveIn analytical chemistry, argentometry is a type of titration involving the silver(I) ion. Typically, it is used to determine the amount of chloride present in a sample. The sample solution is titrated against a solution of silver nitrate of known concentration. Chloride ions react with silver(I) ions to give the insoluble silver chloride:
Article
6 sectionsContents
- Methods
- Volhard
- Mohr
- Fajans
- See also
- References
In analytical chemistry, argentometry is a type of titration involving the silver(I) ion. Typically, it is used to determine the amount of chloride present in a sample. The sample solution is titrated against a solution of silver nitrate of known concentration. Chloride ions react with silver(I) ions to give the insoluble silver chloride: Ag+ (aq) + Cl− (aq) → AgCl (s) (K = 5.88 × 10−9)
==Methods== ===Volhard=== An example of back titration, the Volhard method, named after Jacob Volhard, involves the addition of excess silver nitrate to the analyte; the silver chloride is filtered, and the remaining silver nitrate is titrated against ammonium thiocyanate, with ferric ammonium sulfate as an indicator which forms blood-red [[Thiocyanate#Test for iron.28III.29|[Fe(OH2)5(SCN)]2+]] at the end point: Ag+ (aq) + SCN− (aq) → AgSCN (s) (Ksp = 1.16 × 10−12) Fe(OH)(OH2) (aq) + SCN− (aq)→ [Fe(OH2)5(SCN)]2+ + OH−