Which method is used for chloride determination?

• A. Mohr method
• B. Schales and Schales
• C. Argentometric
• D. Volhard

Answer: (B)

Chloride determination is classically done by argentometric titration, where silver ions react with chloride to form insoluble AgCl until all chloride is consumed. The endpoint is reached by using a defined indicator system that signals the excess of silver ions.

Schales and Schales is a well-established, specific procedure within argentometric methods for chloride determination. It provides a straightforward, reliable protocol: titrate the chloride-containing sample with a standard silver nitrate solution and detect the endpoint with the indicator system particular to this method. This makes it a preferred, widely taught approach for chloride analysis in many laboratory settings.

The Mohr method is another argentometric variant using a chromate indicator, Volhard is a back-titration method used under different circumstances, and “argentometric” is a broad category rather than a single procedure. The named Schales and Schales method is commonly regarded as the standard technique for direct chloride determination.