3HCl+HNO33 \mathrm{HCl}+\mathrm{HNO}_{3}3HCl+HNO3
H3PO4+H2SO4\mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4}H3PO4+H2SO4
3HNO3+H2SO43 \mathrm{HNO}_{3}+\mathrm{H}_{2} \mathrm{SO}_{4}3HNO3+H2SO4
3HNO3++HCl3 \mathrm{HNO}_{3}++\mathrm{HCl}3HNO3++HCl