Cm1=n/Vs
n=CmxVs
n=2x0,5
n=1 mol NaOH
n=md/M
1=md/40
md=40 g NaOH
sau Cm=cxρs/MX100
2=cx1050/4000
c=7,619%-initial
ρs=ms/Vs
ms=ρsxVs
ms=1,05x500
ms=525 g solutie NaOH
mapa=Vapa=300mL=0,3L
Vfinal=500+300=800mL
ms final=525+300=825 g
cfinal=40x100/825
cfinal=4,84%
Cm=1/0,8
Cm=1,25 molar