He noted that the difference in L°m  of
the electrolytes NaX and KX for any X is nearly constant For example
at 298 K:
L°
m (KCl) – L°
m (NaCl) = L°
m (KBr) – L°
m (NaBr)
= L°
m (KI) – L°
m (NaI) ≃ 23 4 S cm2 mol–1
and similarly it was found that
L°
m (NaBr)– L°
m (NaCl) = L°
m (KBr) – L°
m (KCl) ≃ 1 8 S cm2 mol–1
On the basis of the above observations he enunciated Kohlrausch
law of independent migration of ions