Reakcja I:

$H{S}^{-}+{\left[Cr\left(OH\right){\left(H_{2}O\right)}_5\right]}^{2+}\to S^{2-}+{\left[Cr{\left(H_{2}O\right)}_6\right]}^{3+}$  

 

Reakcja II:

$HP{O}_4^{2-}+{\left[Cr\left(OH\right){\left(H_{2}O\right)}_5\right]}^{2+}\to H_{2}P{O}_4^{-}+{\left[Cr{\left(OH\right)}_2{\left(H_{2}O\right)}_4\right]}^{+}$