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ms - masa substancji
mr - masa roztworu
masa roztworu = masa substancji + masa rozpuszczalnika
Cp = ms/mr *100%
ms=Cp*mr/100%
mr = 0,5kg
Cp = 4%
ms = 4%*0,5/100%
ms = 2%/100%
ms = 0,02 kg
ms = 20 g
dosypano 20g
ms2= 40g
mr2=520g
Cp2 = ?
Cp2 = 40/520*100%
Cp2 = 7,7%
zad 2
mr = 400g
Cp = 5%
ms=Cp*mr/100%
ms= 5%*400/100%
ms = 0,05*400 = 20
mH2O = 380g
dodano 100g wody
mr2 = 500g
Cp2= 20/500*100%
Cp2 = 4%