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V=250 cm3
d=0,8 g/cm3
Cp=2%
Szukane:
mr=?
ms=?
mr=d*V
ms=Cp*mr/100%
Obliczenia:
mr=0,8 g/cm3*250 cm3
mr=200 g
ms=2%*200g/100%
ms=4 g
Odp: Kwasu salicylowego jest 4 g.
2. Dane:
ms=36 g
mr=100 g+36 g=136g
Szukane:
Cp=?
Cp=ms*100%/mr
Obliczenia:
Cp=36g*100%/136g
Cp=26,47%
Odp: Stężenie procentowe wynosi 26,47%.