What's the effect of concentration on density for liquids?

Adding more solute to a solvent alters the composition of particles in a specified volume of solution. The higher the concentration, the denser a given liquid is going to be. If a concentration of a liquid is high, it indicates many kilograms of particles (mass) also have a high density, and are being packed into a given volume. If the concentration is lower, it means that there is less mass (and thus less density) packed into a given volume. Density is more specifically defined as “mass density”.