Qualitative and quantitative analysis are two methods used to identify and measure the chemical components of a sample. Qualitative analysis is used to identify the presence or absence of certain chemical compounds or elements in a sample. This method involves observing the samples physical properties, such as color, texture, and odor, and performing chemical tests to identify specific ions or functional groups. Qualitative analysis is often used in organic chemistry to identify unknown substances.

On the other hand, quantitative analysis is used to determine the amount or concentration of a particular compound or element in a sample. In this method, we measure the samples physical properties, such as mass, volume, and density, and perform calculations to determine the concentration of a particular element in a sample. Quantitative analysis is often used in analytical chemistry to measure the purity of a substance or to determine the concentration of a particular element in a sample.

In summary, the key difference between qualitative and quantitative analysis in chemistry is that qualitative analysis gives the presence or absence of different chemical components in a sample, whereas quantitative analysis gives the amount of different chemical components present in a given sample.