Chloride Content of Soap— Potentiometric Titration Method

The REX Ti-50 Automatic Potential Titrator allows quick and simple determinations of the chloride content of soap.

Standard Reference

ISO 4323：2018 Soaps — Determination of chloride content — Potentiometric method

This document specifies a potentiometric method for the determination of the chloride content of soaps, containing or not containing other surface active agents, and also of compounded products.

 

The Principle

Potentiometric titration of the chloride (Cl−) ions with standard silver nitrate solution in an acidic medium, by using either a silver ion selective electrode plus a reference electrode or a combined electrode.

Potentiometer, sensitivity 2 mV, covering the range −500 mV to +500 mV. Or an autotitrator.

Electrode, silver Ion Selective Electrode (ISE) with double junction reference electrode (10 % KNO3 in outer junction and saturated AgCl in inner junction) or a combined electrode

Determination，Weigh, to the nearest 0,001 g, the appropriate test portion into a titration vessel. Add 50 ml of water and 50 ml of isopropanol (5.6). The sample solution is stirred and warmed until all soap particles are dissolved. Add 5 ml of nitric acid solution (5.1) and cool the test solution to 25 °C.

 

 

Recommended Configuration

1. Ti-50 Automatic Potential Titrator 

• Range：(-2000.00~2000.00) mV
• mV Accuracy：±0.03% or ±0.2mV
• Support acid-base titration, non-aqueous aqueous phase titration, constant titration, REDOX titration, precipitation titration, complexation titration
• Support the following titration modes: DET (dynamic equivalence point titration), MET (monotone equivalence point titration), SET (Preset Endpoint Titration) and MAT (manual titration).
• Titration methods, curves and results are displayed in detail.

2. Electrodes

• 982243 Silver titration electrode

Model	982243
Name	Silver titration electrode
Body material	Glass
Sensor	Silver
Reference Type	Glass
Junction material	/
Fill Solution	/
Working Temp. (℃)	0~80℃
pH	（0-14）pH
mV	/
Dimension (mm)	Φ12×120
Connector Type	S7-BNC(Q9)

 

4. Titration Setting

• Precipitation titration
• Sample: DET (dynamic equivalence point titration)
• Blank Sample: MET (monotone equivalence point titration)