Hydrazine reacts with KIO₃ in presence of HCI as  ${\mathrm{N}}_2{\mathrm{H}}_4+{\mathrm{IO}}_3^{-}+2{\mathrm{H}}^{+}+{\mathrm{Cl}}^{-}⟶\mathrm{ICl}+{\mathrm{N}}_2+3{\mathrm{H}}_2\mathrm{O}$

The equivalent masses of N₂H₄ and KIO₃ respectively are: [KIO₃ = 214]