Question

Peste 500g sol Hcl 20% se adauga 100g apa

Se cere :

a) ce se intampla cu concentratia solutiei

b) are este c% a solutiei finale

Answer 1

prin adaugare de solvent, solutia se dilueaza ( c2%<c1%)

solutia 1

c1= md1x100/ms1---> md1= 500x20/100g= 100g HCl

solutia 2

md2=md1

ms2= ms1+m,apa

c2= 100x100/(500+100)=16,6%