Составьте реакции na2o→naoh→naHso4→na2so4→so3
Na₂O+H₂O=2NaOH NaOH+H₂SO₄=NaHSO₄+H₂O NaHSO₄+NaOH=Na₂SO₄+H₂O Na₂SO₄-t->Na₂O+SO₃