a) macid citric = 40 x6,5/100
=2,6g care este md solutiei
md=2,6g
mapa= 40g
ms = md + mapa
= 2,6g + 40g
= 42,6g
c= md/msx100
c = 2,6/42,6x 100
c = 6,10%
b) calculam masa de acid citric din 200g suc lamaie
macid = 200x6,5/100
=13g este md solutiei
Calculam masa solutiei ce contine 13g acid citric si are c=1%
c =md/msx100
ms = mdx100/c
ms= 13x100/1
= 1300g
ms = md +mapa
mapa = ms - md
=1300-13
=1287g