Which of the following is NOT an acceptable way to express solution concentration?

The concentration of a solution can be expressed in various ways, depending on the properties of the solute and solvent involved. Each of the given choices represents a common method of expressing concentration, except for one that is less conventional or even incorrect in usage.

Mass/mass (m/m), weight/weight (w/w), and volume/volume (v/v) are all widely accepted methods for quantifying concentration. Mass/mass expresses the concentration as the mass of solute per mass of solution, while weight/weight conveys the same concept, just using weight rather than mass (though in many contexts, weight and mass can be used interchangeably). Volume/volume indicates the concentration as the volume of solute per volume of solution.

However, volume/mass (v/m) is not commonly accepted or used in standard practices for expressing concentration. It implies a comparison between volume and mass, which does not provide a direct or meaningful representation of how substances interact in a solution. Therefore, it is appropriate to indicate that this method does not align with conventional norms in expressing concentrations of solutions.

In summary, understanding the expectations for concentration expressions helps ensure clarity in communication within the scientific community; having a succinct understanding of which methods are standard is crucial for accurate interpretation and