NaOH + HCl ---> NaCl + H2O
md = c*ms / 100 = 36,5 * 200/100=73 g HCl
la 40 g NaOH.....36,5 g HCl
la x g NaOH......73 g HCl x = 80 g NaOH = md NaOH
c% = 80/200 * 100 = 40% pt solutia de NaOH
la 40 g NaOH.....18 g H2O
la 80 g NaOH.......x g H2O x = 36 g H2O
la 36,5 g HCl.........58,5 g NaCl
la 73 g HCl...............x g NaCl x = 117 g NaCl
c%=md/ms * 100 = 153/400 * 100 => c%=38,25 %
md final = md NaOH + md HCl = 73 + 80 = 153 g
ms final = ms NaOH + ms HCl = 200 + 200 = 400 g
