Question

Se amesteca 3 solutii:m1=500g;c1=25%;m2=300g;c2=30%;m3=150g;c3=15%
Sa se calculeze concentratia solutiei finale.

Answer 1

md1 = (c1 * ms1) : 100
md1 = (25 * 500) : 100
md1 = 12500 : 100
md1 = 125g

md2 = (c2 * ms2) : 100
md2 = (30 * 300) : 100
md2 = 9000 : 100
md2 = 90g

md3 = (c3 * ms3) : 100
md3 = (15 * 150) : 100
md3 = 2250 : 100
md3 = 22.5g

md = md1 + md 2 + md3
md = 125 + 90 + 22,5
md = 237,5g

ms = ms1 + ms2 + ms3
ms = 500 + 300 + 150
ms= 950g

c = (md * 100) : ms
c = (237,5 * 100) : 950
c =   23750 : 950
c = 25%