n Na2O = 15,5/62 = 0,25 mol
Na2O + H2O -> 2NaOH
=> n NaOH = 0,5 mol
Ta co phuong trinh :
2NaOH + H2SO4 ---> Na2SO4 + 2H2O
0.5 ...........0.25..........................................mol
=> m H2SO4 = 0,25.98 = 24,5g
=> m dd H2SO4 = 24,5/20% = 122,5g
=> V dd H2SO4= mdd / D = 122,5/1,14 ~ 107,5 ml