Question

ce masa de sare trebuie adaugata la 12 kg solutie de 2% pentru a obtine o solutie de 5 %?rezolvare,va rog

Answer 1

ms1=12 kg;c1=2%,c2=5%,md2=?
c1=(md1/ms1)*100=>md1=(ms1 * c1)/100=(12*2)/100=0,24 kg sare
ms2=ms1+md1=12 + 0,24=12,24 kg
c2=(md2/ms2)*100=>md2=(ms2 * c2)/100=(12,24 * 5)/100=>md2=0,612 kg sare