Preparation:
• Dissolve 7.5 g of sodium nitrite in 800 ml of purified water.
• Make up with purified water to produce 1000 ml.
• Standardize the solution in the following manner.
• Make up with purified water to produce 1000 ml.
• Standardize the solution in the following manner.
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.
• 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 molarity of solution by following formula:
Sulphanilamide in mg
M = ------------------------
NaNO2 in ml x 17.22
• Calculate molarity of solution by following formula:
Sulphanilamide in mg
M = ------------------------
NaNO2 in ml x 17.22
