Preparation of 0.1 N Hydrobromic Acid Solution

Procedure:- Preparation of 0.1 N Hydrobromic Acid Solution first take volumetric flask to dissolve 8.0 gms of Hydrobromic acid in 200ml of glacial acetic acid in a 500ml volumetric flask. After complete dissolution makes up for to mark with glacial acetic acid.

Standardization of HBr Solution  

Analytically weigh 0.4±0.005 gm of Potassium Hydrogen Phthalate into a 100 ml Erlenmeyer flask. Weight a duplicate into a second flask.

Add 10 ml of glacial acetic acid to each sample and heat gently to dissolve the Potassium Hydrogen Phthalate. 

Titrate the sample using approximately 12.5 ml of the 0.1N HBr solution to a green color using two to three drops of methyl violet indicator.

The solution will change from purple to dark, then light, blue until obtaining the green color. The final color change is obvious. End Point- blue until obtaining the green color

Normality of original in HBr solution         =          Weight of Pht X 1000

               204.2 X ml of HBr 

PREPARATION OF STANDARD 1(M) Sodium Sulphite (Na₂SO₃) SOLUTION
Weigh out accurately 31.5 gm of Sodium Sulphite (Na₂SO₃) and quantitatively transfer to a 250ml volumetric flask. Make up the volume up to the mark with distilled water and shake to make a standard 1 (M) Sodium Sulphite solution. Keep it in the volumetric flask under stoppered conditions.

This is a standard 1 (M) Sodium Sulphite solution. 

PREPARATION OF 0.1 N OF AQ.KOH SOLUTION

Dissolve 2.8gms of KOH flakes (potash alkali) in 200ml of Distilled water in a 500ml volumetric flask. After complete dissolution makeup up to mark with distilled water.

Standardization of KOH solution

Make a standard 0.1 N Oxalic Acid solution and take 25ml of this solution with the help of the pipette in the conical flask and titrate against KOH solution by using Phenolphthalein as an indicator.

Endpoint – Colorless to violet. 

N1V1 = N2V2 

                      N1      = N2V2 

                                        V1

Where

N1 = Normality of KOH

V1 = Volume of KOH

N2 = Normality of Oxalic Acid

V2 = Volume of Oxalic Acid 

HBR Molar Mass

Hydrogen bromide (HBr) has a molar mass of 80.91 grams per mole.

To calculate the molar mass of HBr, the atomic masses of each element in the molecule are added.

Hydrogen (H): 1 atom x 1.01 g/mol = 1.01 g/mol Bromine (Br): 1 atom x 79.90 g/mol = 79.90 g/mol

Total molar mass of HBr = 1.01 g/mol + 79.90 g/mol = 80.91 g/mo

The molar mass of hydrogen bromide is 80.91 grams per mole.

DETERMINATION OF OXIRANE OXYGEN CONTENT