Calculeza partea de masa de KOH in solutia obtinuta prin amestecarea a 100 g solutie de KOH de 10% cu 50 g solutie de 50%.

ms₁ = 100g sol. KOH
C₁ = 10%
ms₂ = 50g sol. KOH
C₂ = 50%

C₁ = md₁/ms₁×100 ⇒ md₁ = C₁×ms₁/100 = 10×100/100 = 10g KOH
C₂ = md₂/ms₂×100 ⇒ md₂ = C₂×ms₂/100 = 50×50/100 = 25g KOH

md final = md₁+md₂ = 35g KOH
ms final = ms₁+ms₂ = 150g sol. KOH

C final = md final/ms final× 100  = 35/150×100 = Calculeaza !