80g roztworu 5% 120 g roztworu 25% ms=Cp*mr/100% ms1=80g*0,05=4g ms2=120g*0,25=30g Cp=3400g/200 %=17%
m(r1)=80g c(p1)=5% m(r2)=120g c(p2)=25% c(p)=? m(r)=m(r1)+m(r2)=80+120=200[g] 80g r1 - 100% xg s1 - 5% x=5%*80g/100%=4g 120g r2 - 100% yg s2 - 25% y=25%*120g/100%=30g m(s)=m(s1)+m(s2)=4+30=34[g] 200g r - 100% 34g s - z% z=34g*100%/200g=17% - c(p) Odp. Stężenie procentowe otrzymanego r-ru wynosi 17%.
dane: m1=80g cp1=5% m2=120g cp2=25% szukane: cp3=? cp1*m1+cp2*m2=(m1+m2)*cp3 5%*80g+25%*120g=(80g+120g)*cp3 400+3000=200cp3 3400=200cp3 /:200 cp3=17%
