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Ce cantitate de apa se adauga peste 600g solutie de concentratie 50% pentru a o dilua la o concentratie de 30% ?!
Repede va rog!!!
22 puncte


Răspuns :

c1=50%
ms1= 600g
c=mdx100/ms----> 50=md1x100/600=300g

c2=30%
md2=md1=300g
ms2=md1x100/c2= _>ms2=1000g

m,apa adaugata =1000-600=,,,,,,,,,,,,,,,,,