Final answer:
The normality of a solution cannot be less than zero because it is a measure of concentration, and concentration values cannot be negative
Step-by-step explanation:
The normality (N) of a solution can never be less than zero. Normality is a measure of concentration equivalent to the molarity multiplied by the number of equivalents of the solute. An equivalent is defined based on the solute's ability to donate or accept protons, donate or accept electrons, or precipitate or complex with other species. Since the concentration of a substance in solution cannot be negative, normality, as a measure of concentration, also cannot be negative. This can be understood by considering that the dilution process does not change the amount of solute in the solution, as represented by the formula n₁ = n₂, where the subscripts “1” and “2” refer to the solution before and after the dilution, respectively.