Oblicz stężenie procentowe roztworu otrzymanego w wyniku zamieszania 250g roztworu o stężeniu 20% i 750g roztworu o stężeniu 40%.

mr1=250g Cp1=20% ms1=? mr2=750g Cp2=40% ms2=? ms1=Cp1*mr1/100% ms1=20%*250g/100% ms1=50g ms2=Cp2*mr2/100% ms2=40%*750g/100% ms2=300g Cpx=(ms1+ms2)*100%/(mr1+mr2) Cpx=(50g+300g)*100%/(250g+750g) Cpx=350g*100%/1000g Cpx=35

250g 20%..................40 - x ....................x% 750g 40%...................x - 20 250/750 = 40-x/x-20 250(x-20) = 750(40-x) 250x-5000 = 30000-750x 1000x = 35000 x = 35%