Question

Peste 6 kg de solutie zahar de concentratie 60% se adauga o solutie zahar 10% obtinanduse o solutie de concentratie 40%.
Care este masa solutiei de concentratie 10% necesara?

Answer 1

ms1=6kg
c1=60%
c2=10%
c3=40%

ms2?

c3= (md1+md2)x100/ (ms1+ms2)
    =(c1ms1+c2ms2)x100/(ms1+ms2)
 40  = (0,6x6+ 0,1ms2)x100/ (6+ms2)
40(6+ms2)= 360+10ms2-------------------------> calculeaza ms2 !!!