Sprzężone pary: 

Kwas 1 :  $Fe{\left(H_{2}O\right)}_6{]}^{3+}$  

Zasada 1:  $Fe{\left(H_{2}O\right)}_5\left(OH\right){]}^{2+}$  

Kwas 2 :  $H_3{O}^{+}$  

Zasada 2:  $H_{2}O$