Molecular formula: KCl
Molecular weight: 74.55
Principle: It is a direct precipitation titration of potassium chloride with silver nitrate. Potassium chromate is used as an indicator. At the endpoint, the excess silver nitrate reacts with the indicator to give a brick-red-colored precipitate.
Preparation of 0.1M AgNO3 solution: Dissolve 17 gm of silver nitrate in sufficient water and make up a volume of up to 1000 mL with water. Standardization of 0.1M AgNO3 solution: Weigh accurately about 0.1 g of sodium chloride, previously dried at 110°C for 2 hours, and dissolved in 5 mL of water. Add 5 mL of acetic acid, 50 mL of methanol, and 0.15 mL of eosin solution. Stir, preferably with a magnetic stirrer, and titrate with the silver nitrate solution. Store the solution in a well-closed container protected from light.
Reaction:
NaCl + AgNO3 → AgCl ↓ + NaNO3
Factor calculation:
1 Mole of AgNO3 ≅ 1 mole of sodium chloride
1000 mL of 1M AgNO3 ≅ 58.44 g of NaCl
1 mL of 0.1 M AgNO3 ≅ 0.005844 g of NaCl
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