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2) Na₂O + H₂O -----> 2NaOH
3) 2NaOH + Cu(NO₃)₂ ---> Cu(OH)₂ + 2NaNO₃
4) 2NaOH + H₂SO₄ ---------> Na₂SO₄ +2 H₂O
lub
2NaOH + SO₃---------> Na₂SO₄ + H₂O
5) 2Na + H₂SO₄ ---------> Na₂SO₄ + H₂