Chemical Analysis of Sodium Chloride

Introduction

Sodium Chloride determination

Evaluation of salt concentration (sodium chloride) present in foodstuffs is very important mainly for the reason of preservation and taste of the food products.
Total chloride in the food is usually determined and can be presented as sodium chloride content.
Insignificant components of foods may also provide chloride ions but those food products to which salt is added are essentially analysed for sodium chloride content.


Salt content of the food may be analytically determined in one of the following ways:

1. Chemical techniques

Titrimetric methods are the most widely used for salt determination and are usually based on the following methods:

- Titration Mohr method

The Mohr method uses chromate ions as an indicator in the titration of chloride ions with a silver nitrate standard solution. Following the precipitation of the whole amount of chloride (usually as white silver chloride) the first excess of titrant results in the production of a silver chromate precipitate, that indicates the end point.

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