Question

Prepara dupa un proiect propriu, o solutie de sare, de concentratie 20%, folosind 200g de solutie de sare de concentratie 40%
Cate grame de apa trebuie adaugate?

Answer 1

Răspuns:

ms1=200g

C=20%

C=40%

mH2O=?

md=ms*C/100=200*20/100=40g sare

ms=md*100/20=40*100/20=100g sare

mH20=ms1-ms2=200-100=100g