Question

O solutie de sare cu apa are masa de 1 kg si concentratie de 10% . 
a) Aflati masa de sare dizolvata in solutie.
b) Daca adaugam in solutie inca 200 g de sare , determinati concentratia noii solutii .

Answer 1

a) la 1 kg de sare 10% inseamna ca 100 gsare se dizolva in 900 ml apa
b) 1000g+200g=1200g
1200......................x
1000......................10%
x=12%