P17.1
Active Matter Determination for Anionic Surfactants — Potentiometric Titration
Procedure 1 of 40 · Chapter 17 · §17.1.2
2 tables 0 notes
Table 1
| Reagent | Specification | Concentration / Preparation |
|---|---|---|
| Hyamine 1622 (benzethonium chloride), standard solution | 0.004 M (≈1.792 g/L), standardized against sodium lauryl sulfate primary standard | Dissolve 1.792 g in distilled water, dilute to 1000 mL; standardize |
| Sodium lauryl sulfate (SLS), primary standard | ≥99.0% purity, dried at 105°C for 2 h | 0.004 M: dissolve 1.151 g in water, dilute to 1000 mL |
| Sodium nitrate conditioning solution | 0.01 M NaNO₃ aqueous | Dissolve 0.850 g NaNO₃ in water, dilute to 1000 mL |
Table 2
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Sample mass | 0.3256 | g | |
| Total dilution volume | 100.0 | mL | |
| Aliquot volume titrated | 10.00 | mL | |
| Hyamine 1622 molarity | 0.00412 | mol/L | |
| Endpoint volume | 7.85 | mL | |
| Molecular weight (LAS) | 320 | g/mol | |
| Calculated active matter | — | 31.8 | % |