Question

Se trateaza 200g solutie de acid clorhidric de concentratie 36,5% cu o solutie de hidroxid de sodiu cu concentratia 20%.
Care este concentratia procentuala a solutiei obtinute?
Plizz ajutoooor!! Dau 20 puncte!! Repede va rog!!

Answer 1

Cp=md/ms*100=>md=Cp*ms/100=36.5*200/100=73g HCl

HCl + NaOH = NaCl + H2O

36.5g HCl...............40g NaOH
73g HCl..................x=80g NaOH

Cp=md/ms*100=>ms=80*100/20=400g sol NaOH

mdf=80+73=153g
msf=400+200=600g

Cpf=mdf/msf*100=153/600*100=Calculează!!