What is the primary use of chromatography?

Chromatography is primarily used to separate the components of a mixture based on their different interactions with a stationary phase and a mobile phase. This technique involves passing the mixture through a medium where various components travel at different rates, allowing for their separation. For instance, in paper chromatography, substances are separated due to differences in solubility and adhesion to the paper.

This separation is crucial in various applications, such as purifying chemical substances, analyzing complex mixtures, and identifying individual components in compounds. The other options involve specific measurements or assessments, such as concentration, pH, or molar mass, which do not align with the primary purpose of chromatography.