QUANTITATIVE ORGANIC ANALYSIS

QUANTITATIVE ORGANIC ANALYSIS

Sulphur Analysis:

Sulphur in the organic compound is converted to sulphate ion (SO₄^2-). This is done by two methods. (a). Paar method (b). Carius method.

In paar method, the organic sample is heated in a bomb with sodium peroxide and in carius method, the sample is heated in a sealed tube containing nitric acid. The sulphate ion is then converted to barium sulphate which is weighed. From the weight of SO₄^2-  obtained, the weight and percentage of sulphur are determined.

Halogen Analysis:

The halogens in the compound are converted to halides using Paar method or Carius method. The halide ion is converted to silver halide using silver trioxonitrate (V) reagent. The silver halide is weighed and from its weight, the weight of the halogen and the percentage composition in the sample are determined.

Phosphorus Analysis:

Phosphorous in the organic sample is converted to phosphate. The phosphate is precipitated as quinoline molybdophosphate using a modified qualitative analytical method. This is isolated and titrated with standard sodium hydroxide solution. The amount of molybdophosphate and hence the amount of phosphorous is determined from the titration of results.