Question

Care este masa solutiei de acid clorhidric de c=36,5% necesara neutralizarii a 250g solutie de NaOH de c=20%?

Answer 1

c%=(md/ms)*100=>md NaOH = (c% * ms)/100=>md NaOH = (20 * 250)/100 = 50 g
NaOH + HCl ---> NaCl + H2O
la 40 g NaOH.........36,5 g HCl
la 50 g NaOH.........x g HCl      x=45,625 g=md HCl
c%=(md/ms)*100=>ms = (md/c)*100=(45,625/36,5)*100=>ms HCl = 125 g