Density and concentration are two different physical quantities. Density refers to the ratio of the mass to volume of an object, and concentration refers to the mass or moles of solute in a unit solvent. If you want to convert between the two, you need to consider the physical and chemical properties of the solvent and solute, and choose the corresponding conversion formula according to the actual situation.
For liquid solutions, the common units of concentration are mass concentration (ie the ratio of the mass of solute to the mass of solvent) and molarity (ie the ratio of the number of moles of solute to the volume of solvent). If you know the density of a liquid solution, you can use the following formula to convert between density and concentration:
Mass concentration C (g/mL) = mass m (g) / volume V (mL) = density ρ (g/mL)
Molar concentration C (mol/L) = molar number n (mol) / volume V (L) = density ρ (g/mL) / relative molecular mass M
Among them, the density ρ is the density of the liquid solution, which can be obtained through experimental measurement; the relative molecular mass M is the relative molecular mass or molar mass of the solute, which can be obtained from chemical equations or related literature.
North and South Tide reminds you: the density and conversion formula of different substances may be different, and the appropriate conversion formula needs to be selected according to the actual situation. In addition, when converting between density and concentration, it is also necessary to pay attention to the conversion of units and the precision of the decimal point to avoid unnecessary errors.
