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*100/ms
md=c*ms/100
md=20*250/100=50g NaOH
x                       50
HCl        +      NaOH---->NaCl+H2O
36,5                  40
x=36.5*50/40=46,625 g HCl
ms=md*100/c
ms=46,625*100/36,5=125g HCl