Knowledge database: Stoichiometry: Concentrations

Calculating concentrations is one of the most common types of calculations made in the domain of stoichiometry. The concentration of a substance can be calculated by dividing the quantity of this substance (in the form of mass, volume or amount of that substance) by the volume in which this substance is located.

This definition can simply be represented by the generic formula that can be seen above. As we already mentioned, there are three basic and most commonly used formulas for the calculation of concentrations:

1) The mass concentration: γ(A) = m(A) / V

2) The volume concentration: σ(A) = V(A) / V

3) The molar concentration: c(A) = n(A) / V