Question

Peste 400 g solutie (S1) de hidroxid de sodiu se adauga 240 g de apa distilata.Solutia obtinuta (S2) are concentratia procentuala de masa 10%. Determinati concentratia procentuala de masa a (S1) ​

Answer 1

Răspuns:

Explicație:

ms1=400g

mH2O adaug=240 g

C2=10%

C1=?

ms2=ms1+mH2O=400g+240 g=640 g

c2=md/ms2*100

md=c2ms2/100=10*640/100=64 g

c1=md/ms1*100=64 g*100/400g=16 %