Question

Identify each of the tests for an illegal drug as quantitative or qualitative.

The test shows that the sample dissolves in water.

The test indicates that the sample is 85% carbon by mass.

The test indicates that there are three compounds in the sample.

The test reveals a blue color when the drug is present.

The test shows that the molar mass is 694.3 g/mol.

Answer 1

(a): Dissolution of a substance in water is a qualitative property. Because dissolution of the substance can be seen by eye.

(b): To find 85% by mass we have to make calculations and experiment. Hence this is a quantitative property.

(c): Presence of 3 compounds in the sample tells about what is present in the sample. Hence this gives about the quality of a substance. Hence this is a qualitative analysis.

(d): Color is a quality of a substance. Hence finding blue color is a qualitative analysis (property)

(e): We need calculations to find 694.3 g/mol as molar mass after the experiment. Hence this is quantitative analysis.