Odpowiedź :
Cp=38%
mr=0,5kg=500 g
Cp = ms*100%/mr
ms = Cp*mr/100
ms=38*500/100
ms=190g chlorowodoru
500g roztworu - 190g chlorowodoru = 310g wody
C% = ms × 100%/mr
mr = 0,5 kg = 500g
38% = ms × 100%/500g
ms = 190g (HCl)
m wody = mr - ms
m wody = 500g - 190 g = 310 g