0M

0 M, or zero molarity, is a concentration notation used in chemistry to describe a solution in which the amount of solute dissolved is zero moles per liter of solution. Molarity (M) is defined as the number of moles of solute per liter of solution, so 0 M corresponds to no solute particles present in the solution phase. In other words, a 0 M solution is effectively a pure solvent under the stated conditions.

In practice, achieving exact 0 M can be challenging due to trace impurities, dissolved gases, and background signals in analytical measurements. A true 0 M solution would contain no dissolved solute at all, but laboratories typically work with blanks or solvent controls that approximate this state for calibration, baseline subtraction, or instrument validation.

Preparation and interpretation: To obtain 0 M, one would use only the solvent and ensure no solutes are added. In analytical contexts, the concept of 0 M provides a baseline for comparison; measured concentrations are often reported relative to this zero point. The term also serves as the lower bound on the molarity scale; values greater than 0 M indicate increasing solute concentration. Note that 0 M is not a negative quantity and does not imply a physical impossibility, but rather an absence of dissolved solute in the defined solvent volume.

Other notes: While 0 M specifically refers to molarity, it is related to, but not interchangeable with, other concentration units such as g/L or percent composition. Impurities and experimental conditions can influence whether a solution is treated as 0 M in practice.