Na + H2SO4 = Na2SO4 + H2 (2:1:1:1)K + H2O = KOH + H2 (2:2:2:1)X + 2H2O = Na2SO4 + 4H2 (1:4:1:4)CuSO4 + 2H2O = Cu(OH)2 + 2H2 (1:2:1:2)
Na + H2SO4 = Na2SO4 + H2 (2:1:1:1)
K + H2O = KOH + H2 (2:2:2:1)
X + 2H2O = Na2SO4 + 4H2 (1:4:1:4)
CuSO4 + 2H2O = Cu(OH)2 + 2H2 (1:2:1:2)