nNa2O=15.5/62=0.25(mol)
Ta có phương trình
Na2O + H2O ➞ 2 NaOH
0.25.......0.25............0.5.........(mol)
CM NAOH=0.5/0.5=1M
2NaOH + H2SO4 ➞ Na2SO4 + 2H2O
0.5..............0.25............0.25................(mol)
mdung dịch H2SO4 = 0.25*98*100/20=122.5(g)
Vdung dịch H2SO4 =122.5/1.14=107.456(ml)
c)CM H2SO4=0.25/(0.5+0.107456)=0.411M