Al+H2SO4=+H2+Al2(SO4)3
Fe+2HCl=H2+FeCl2;
Ca+2HNO3=H2+Ca(NO3)2;
3Mg+2H2PO4=2H2+Mg3(PO4)2
<span>Ba(OH)2 избыток+HNO3=BaOHNO3+H2O обмена
Ba(+2)+2OH(-)+H(+)+NO3(-)=BaOH(+)+NO3(-)+H2O
Ba(+2)+2OH(-)+H(+)=BaOH(+)+H2O</span>
2Ca+O2→ 2CaO
CaO+H2O→ Ca(OH)2
<span>Ca(OH)2 + Ca(HSO3)2 → 2CaSO3 + 2H2O
</span><span>CaSO3 + 2HNO3 → Ca(NO3)2 + SO2 + H2O
</span><span>SO2 + H2O ⇄ H2SO<span>3</span></span>