Ile cm3 wody należy dodać do 100 cm3 15% roztworu, o gęstości 1,2g/cm3, aby otrzymać roztwór 5% ?
Daje Naj :D
V=100cm³
ms=?
Cp=15%
d=1,2g/cm³
Mr=V·d=100·1,2=120g
Cp=Ms/Mr·100%
15%=Ms/120·100%
Ms=18g
5%=18/Mr·100%
Mr=360g
360g-120g=240g - trzeba dolać
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V=100cm³
ms=?
Cp=15%
d=1,2g/cm³
Mr=V·d=100·1,2=120g
Cp=Ms/Mr·100%
15%=Ms/120·100%
Ms=18g
5%=18/Mr·100%
Mr=360g
360g-120g=240g - trzeba dolać