Calculating the Percentage of Nitrogen in an Organic Compound

Organic Compound Analysis

0.3g of an organic compound was kjeldahlised and ammonia evolved was absorbed into 45ml of semi-normal solution of sulphuric acid. The residual acid solution was diluted with distilled water and the volume was made up to 150ml. 20ml of this diluted solution required 31ml of 0.05 N NaOH solution for complete neutralization.

Calculation of Nitrogen Percentage

To calculate the percentage of nitrogen in the compound, we can use the following formula:

Percentage of Nitrogen = (Volume of Acid Solution x Normality of NaOH x Equivalent Weight of Nitrogen x 100) / Weight of Compound

Solution:

Volume of Acid Solution = 20ml

Normality of NaOH = 0.05 N

Equivalent Weight of Nitrogen = (14g/mol)

Weight of Compound = 0.3g

Calculating the Percentage of Nitrogen:

Percentage of Nitrogen = (20ml x 0.05 N x 14 x 100) / 0.3g

Percentage of Nitrogen = (1400) / 0.3

Percentage of Nitrogen = 466.67%

Result:

The calculated percentage of nitrogen in the organic compound is 466.67%.

How was the percentage of nitrogen in the organic compound calculated?

The percentage of nitrogen in the organic compound was calculated using the formula: (Volume of Acid Solution x Normality of NaOH x Equivalent Weight of Nitrogen x 100) / Weight of Compound.