Preparation
Dissolve 17g of silver nitrate in sufficient chloride free water to produce 1000 ml.
Standardisation
Weigh accurately about 0.1g sodium chloride, previously dried at about 110ยบ C for 2 hours and dissolve in 5 ml of water. Add 5 ml of glacial acetic acid, 50 ml of methanol and 0.15 ml of eosin solution. Titrate with silver nitrate solution with constant stirring to purple end point.
Each ml of 0.1 M silver nitrate ≡ 0.005844 g of sodium chloride.
Perform a duplicate and calculate the Molarity factor (MF)
Note down the average value
Calculation
MF = W/0.005844 X V
Where
W = Weight of sodium chloride in gm.
V = Volume of silver nitrate solution consumed in ml.
Note:
1) Restandardise before use
2) Discard the solution after 30 days.
Store in amber bottle with well fitted suitable stoppers which prevents access to atmospheric carbon dioxide.
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