Determination of assay for Cetyl trimethyl ammonium bromide

Here below is the method of analysis for Cetyl trimethyl ammonium bromide shared by Ahsuperchem:

1. Reagents and Solutions:

1. Anhydrous Ethanol: Analytically pure
2. Calcium Carbonate: Analytically pure
3. Fluorescent Yellow Ethanol solution: 1g/L
4. Silver Nitrate standard solution: c(AgNO₃) = 0.1mol/L

2. Analysis Steps:

2.1 Weigh 0.35g (accurate to 0.0002g) sample into 50mL Ethanol, add 25mL pure water, 0.1g Calcium Carbonate and 8 drops Fluorescent Yellow Ethanol solution. Titrate by 0.1mol/L AgNO₃ standard solution. The solution turn to pink red, as the titration end point.

2.2 Result Calculation:

Calculate the Assay X% of  Cetyl trimethyl ammonium bromide in sample according to following formula: