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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 × 109) ==Volhard method== 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 ()2+ at the end point: : Ag+ (aq) + SCN− (aq) → AgSCN (s) (''K''sp = 1.16 × 10−12) : Fe(OH)(OH2)52+ (aq) + SCN− (aq)→ ()2+ + OH− 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Argentometry」の詳細全文を読む スポンサード リンク
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