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500g roztw ---x
x=20g subst
mH2O=Mr-Ms=500-20=480g
mNaCl=20g
1g----1cm3
480g---x
x=480cm3
x-4%
x=20g
500g-20g=480g
480g=480cm3
odp.Należy odważyć 20g NaCl i 480cm3 wody.