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Cp = 12%
Ms dodanej = 20g
Obliczamy ile substancji było najpierw :
Ms = 60g * 12% = 7,2g
dodajemy 7,2 + 20g = 27,2g (substancja)
Roztwór 60g+ 20g= 80g
Cp= 27,2 *100% /80g
Cp =34%