2Ba + O2 = 2BaO BaO + H2O = Ba(OH)2
2NaOH + 2Na = 2Na2O + H2
2Cu + O2 => 2CuOCuO + H2SO4 => CuSO4 + H2OCuSO4 + 2NaOH => Cu(OH)2(осадок) + Na2SO4Cu(OH)2 -> CuO + H2O
2Ba + O2 = 2BaO
BaO + H2O = Ba(OH)2
2NaOH + 2Na = 2Na2O + H2
2Cu + O2 => 2CuO
CuO + H2SO4 => CuSO4 + H2O
CuSO4 + 2NaOH => Cu(OH)2(осадок) + Na2SO4
Cu(OH)2 -> CuO + H2O