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m1=200g
cp1=4%
m2=300g-200g=100g
m3=300g
cp3=5%
szukane:
cp2=?
m1 *cp1 +m2 *cp2=m3 *cp3 /-m1 *cp1
m2 *cp2= m3 *cp3 -m1 *cp1
100g *cp2=300g *5 % -200g *4%
100cp2=1500 -800
100cp2=700 /:100
cp2=7%
odp:stężenie dolanego roztworu jest równe 7%.