How to Determine Normality of Sodium Thiosulfate
Appratous
Volumetric flask
Burette
Pipette
Conical flask (Erlenmeyer flask)
Beaker
Measuring cylinder
Stirring rod
Funnel
Dropper
White tile (for better visibility during titration)
Wash bottle (for distilled water)
Normality of Sodium Thiosulfate
10 ml K₂Cr₂O₇
25 ml water.
5 ml conc. HCl
KI 10% 20 ml.
5 minutes shake in dark Room place 20 minutes.
75 ml to 100 ml D.W.
Titrate with 0.1 N Na₂S₂O₃
Shaking continuously untill yellow colour.
using starch indicator (3 ml).
Titrate until green colour appears from black.
Calculation
V1N1=V2N2
N1=V2N2/V1
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