Preparation and Standardization of 0.1 M Sodium Nitrite

Sodium Nitrite Solution Preparation

• Dissolve 7.5 g of sodium nitrite in 800 ml of purified water.
• Makeup with purified water to produce 1000 ml.
• Standardize the solution in the following manner.

Sodium Nitrite Solution Standardization

• Dissolve 0.3 g of Sulphanilamide in 50 ml of 2 M hydrochloric acid.
• Add 3 g of potassium bromide, cool in ice and titrate with the sodium nitrite solution determining the end-point potentiometrically.
• 1 ml of 0.1 M sodium nitrite is equivalent to 0.01722 g of Sulphanilamide.
• Calculate the molarity of solution by the following formula:

       Sulphanilamide in mg
M = -------------------------------
       NaNO2 in ml x 17.22
Also see: Determination of Shelf Life of Solutions in Laboratory