# Why is M1*V1 = M2*V2 only used for diluting solutions?

Why is $M_1V_1 = M_2V_2$ only used for diluting solutions? Why can it not be used to figure out how many moles to add to make a solution more dilute?

• Because it is based on conservation of moles. $M_1V_1=\text{moles before dilution}=M_2V_2=\text{moles after dilution}$ – Satwik Pasani Jan 13 '14 at 16:55

$$\dfrac{mol_1}{V_1} \times {V_1} = \dfrac{mol_2}{V_2} \times {V_2}$$