What distinguishes quantitative results from qualitative results?

Quantitative results are distinguished by their ability to provide numerical data that indicates the specific amount or concentration of a substance present in a sample. For example, a quantitative analysis might reveal that a water sample contains 50 milligrams of a contaminant per liter. This type of analysis is essential when precise measurements are required for regulatory compliance or when assessing the safety of drinking water.

On the other hand, qualitative results are designed to confirm the presence or absence of a substance without indicating how much is present. A qualitative test might only indicate whether a contaminant is detected in the water sample or not, without providing details about the quantity. This distinction is crucial in laboratory settings where understanding both the presence of contaminants and their concentrations is important for making informed decisions about water quality and safety. Therefore, the correct choice accurately captures the fundamental difference between these two types of analytical results.