Question

Concentratia procentuala a unei solutii obtinute prin dizolvarea a 10g de sare in 90g de apa este: a)20% b)90% c)10% d) 40%

Answer 1

md = 10 g

ms =  md + m.apa = 90 + 10 = 100 g

c% = md*100/ms => c% = 10*100/100 = 10%