0.1 M Silver Nitrate Solution Preparation and Standardization

Aim: Preparation and Standardization of 0.1 M Silver Nitrate (AgNO₃) solution by using sodium chloride in Pharmaceutical Labs.

Name: 0.1 M Silver Nitrate (AgNO₃)

Reagents used to Prepare and Standardization of 0.1 M AgNO₃ :

• Silver Nitrate (AgNO₃)
• Acetic acid (CH₃COOH)
• Sodium chloride (NaCl)
• Methanol (CH₃OH)
• Eosin Y solution (indicator)

Glassware: Volumetric Flask, measuring cylinder, Burette, Conical Flask, beaker, and Pipettes.

Principle:

In the lab, we used a process where we mixed silver nitrate with sodium chloride. This causes a white, lumpy substance called AgCl and sodium nitrate. We know the reaction is complete when the color changes from a yellow-green to a pinkish-purple. This color change happens because of a special chemical called Eosin Y, which reacts with extra silver ions. We do this experiment in acidic conditions, with a pH of about 2, and it should be done in the dark.

How to Prepare 0.1 M Silver Nitrate:

Dissolve 17.0 grams of Silver Nitrate in enough double distilled water to make 1000 milliliters.

How to Standardization 0.1 M Silver Nitrate:

• Precisely weighs about 0.1 grams of sodium chloride, which has been dried at 110 degrees for 2 hours.
• Dissolve it in 5 milliliters of distilled water.
• Add 5 milliliters of acetic acid, 50 milliliters of methanol, and 0.15 milliliters of eosin Y solution.
• Stir it, preferably using a magnetic stirrer, and titrate it with the silver nitrate solution.
• Each milliliter of 0.1 M silver nitrate is equal to 0.005844 grams of NaCl.

Reaction:

NaCl + AgNO₃ → AgCl+ NaNO3

Calculations:

Reference: Indian Pharmacopoeia