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2mole kwasu----1000cm3 roztworu
xmoli kwasu-----200cm3 roztworu
x=0,4mola kwasu
Dolewam 400cm3 wody, więc
0,4mola kwasu------600cm3 roztworu
xmoli kwasu--------1000cm3 roztworu
x=0,67mola kwasu
x=0,67mol/dm3