Răspuns:
se stie ro=m/v
5.
a.V,apa=150ml----> m,apa= roxV,apa= 150g
b. masa solutiei obtinute= m,apa+m,soda= 150g+70g=220g
ro= V,sol/m,sol=
V.sol= V,apa+10ml= 160ml
ro= 220/160g/ml=1,375g/ml
6.V,apa= 200ml
m,apa= roxV,apa=200g
m,sol.soda= 1,43x300g=429g
V,sol.finala= 200ml+300ml=500ml
a, m,sol.finala= 200g+429g=629g
b. ro=m/V= 629/500g/ml=1,258g/ml
Explic
