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ms- masa substancji
mr-masa roztworu
mw-masa wody
Cp - stezenie procentowe
mr=200g
Cp=20%
Cp=ms/mr*100%
ms=mr*Cp/100%
ms=200*20/100
ms=40g
mw=mr-ms
mw=200-40=160g
Nowe Cp:
ms=40g+20g=60g
mw=160+50=210
mr=ms+mw
mr=60+210=270g
Cp=ms/mr*100%
Cp=60/270*100
Cp=22,2%
Liczę na naj !!! ;)