Ile gramów NaBr należy dodać do roztworu 15% 150g, aby otrzymać roztwór 20%?
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Cp1=15%
mr1=150g
ms1=(Cp1*mr1)/100%=(15%*150)/100%=22,5g
Cp2=20%
x=dodana masa NaBr
20%=22,5+x/150+x * 100%
0,2=22,5+x/150+x
30+0,2x=22,5+x
x=9,375g (dodany NaBr)