Question

Peste 200 g solutie alcool si apa de C 20% se adauga inca 250 g apa de C proncentuala va avea solutia finala.

Answer 1

Alcoolul se ridica deasupra apa ramine desupt

Answer 2

c=(md*100)/ms
md=(c*ms)/100=(20*200)/100=40 g alcool

Solutia finala are masa:
ms=200 g + 250 g = 450 g

Concentratia finala:
c=(md*100)/ms=(40*100)/450=8,88%
Masa de solvat md ramane aceeasi, se modifica numai masa de apa, implicit masa de solutie.