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mr1=200g
Cp1=25%
Cp2-=17%
dw=1g/cm3
Szukane:
mw
Roz:
ms/mr1=Cp1/100%
ms=mr1*Cp1/100%=200g*25%/100%=50g
ms/mr2=Cp2/100%
mr2=ms*100%/Cp2=50g*100%/17g≈294g
mw=mr2-mr1=294g-200g=94g
d=m/V
V=m/d=94g/1g/cm3=94cm3
Odp: Aby otrzymać roztwór 17 % należy dolać 94 cm3 wody.