Question

Se amesteca 300g de solutie de alcool 60% cu 400g solutie alcool 50%.
Calculeaza concentratia proceantuala a solutiei obtinute dupa amestecare?

Answer 1

datele problemei:
ms₁=300g
c₁=60%
ms₂=400g
c₂=50%

rezolvare:
c₁=md₁*100/ms₁
60=md₁*100/300
md₁=180g

c₂=md₂*100/ms₂
50=md₂*100/400
md₂=200g

md final=200+180=380g

c finala=md final*100/ms final
c final=380*100/700
c final=54,285%