In dilution we add distilled water to decrease the concentration of required sample from high concentration to lower concentration The law used for dilution: M₁V₁]Before dilution = M₂V₂] After dilution M₁ = 1.5 M V₁ = ? M₂ = 0.3 M V₂ = 500 ml 1.5 * V₁ = 0.3 * 500 ml so V₁ = 100 ml and it completed to 500 ml using 400 ml deionized water