2 NaOH + H2SO4 ---> Na2SO4 + 2 H2O 5 kmoli H2SO4 = 5*98 kg = 490 kg acid 2*40 g NaOH.......98 g H2SO4 x kg NaOH..........490 kg H2SO4 x = 400 kg NaOH c%=md/ms*100=>ms=400/20*100=2000 kg solutie NaOH 2*40 g NaOH.........98 g H2SO4 2000 kg sol NaOH.........x kg solutie H2SO4 x = 2450 kg solutie H2SO4