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m=d*v
m=1000cm3*1,11g/cm3=1110g
10g----100g roztw
xg-----1110g
x=111g
1mol NaoH----40g
n moli--------111g
n=2,775mola
NaOH<--->Na+ +OH-
taka sama liczba jonow Na+ i OH-
stezenie molowe Na+ wynosi 2,775 mola/dm3