Why nitric acid is used in volhard's method?
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To perform titration we will need 0.1M silver nitrate solution to precipitate chlorides, titrant - 0.1M potassium thiocyanate solution, nitric acid (1+1) to acidify solution, ammonium ferric sulfate solution that will be used for end point detection, nitrobenzene, and some amount of distilled water to dilute sample.
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The Volhard method is a back-titration developed to tackle this problem. For this process, using excess uniform silver nitrate, chlorides are precipitated to the solution. The silver nitrate that is used is created by the nitric acid reaction of silver foil.
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