Na +O2 --> Na2O
Na2O + H2O ---> NaOH
NaOH+HCl ---> NaCl + H2O
NaCl ---> NaOH + HCl
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(1) \(4Na+O_2\xrightarrow[]{t^\circ}2Na_2O\)
(2) \(Na_2O+H_2O\xrightarrow[]{}2NaOH\)
(3) \(NaOH+HCl\xrightarrow[]{}NaCl+H_2O\)
(4) \(2NaCl+2H_2O\xrightarrow[\text{cmn}]{\text{đpdd}}2NaOH+H_2\uparrow+Cl_2\uparrow\)
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a/ S -> SO2 -> SO3 -> H2SO4 -> Na2SO4
b/ Cu(OH)2 -> CuO -> Cu -> CuSO4
Na2O -> NaOH -> Na2SO3
