Reaction between water and chromium metal

[izen]

Hi there,

How to write the reaction between water and chromium metal under standard (i) acid and (ii) base condition?



Cr + 3H₂O ----> Cr(OH)₃ + 3e^- + 3 H⁺ (acid condition)

basic solution ?


Please help

 

[Borek]

In acid I would start with Cr and H⁺, yielding Cr³⁺.

Cr(OH)₃ is a correct product for alkaline solution, and I would assume OH^- to be one of the reactants.

In reality Cr is passivated by oxides, so its reactions are not that simple.

 

[izen]

thanks