ANALYTICAL TEST PROCEDURE OF CALCIUM HYPOCHLORITE (BLEACHING POWDER)

 

MATERIAL NAME: CALCIUM HYPOCHLORITE (BLEACHING POWDER)
Molecular Formula: Ca(Ocl)Cl	Formula Weight of chlorine: 35.46	Equivalent Weight: 35.46 g

 

SL NO.	Test Parameters	Specification
1.	Physical State	White granular powder
2.	Identification	When 2 ml of acetic acid to 0.1 g of bleaching powder, gas is evolved & it dissolves. 5 ml of water is added then filtered. Ammonium oxalate solution ( 1 g in 30 ml of water) is added to the filtrate with HCl, white ppt is formed.
3.	Purity (%)	65% to 70 % as available chlorine

 

METHOD OF ASSAY ANALYSIS

1. 5 gm of sample is weighed accurately & mixed with 500 ml of water using a morter. 2. Transfer 25 ml 0f stock solution into a conical flask. 3. Add 2g KI+10ml glacial acetic acid. 4. Titrate with 0.1N Na2S2O3 using starch indicator until colorless solution is appeared.

 

CALCULATION OF ASSAY PERCENTAGE

Each ml of 0.1 N Na2S2O3 is equivalent to 3.546 mg of Cl2 Calculation(% available Cl2):  BR×0.003546gm×100/0.25

 

Precautions:

                          1. Standardize Na₂S₂O₃ Solution Before Titration.

                          2. Weighing Should Be Accurate

 

REFERENCE: USP29