Reaction between water and chromium metal

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SUMMARY

The reaction between chromium metal and water varies significantly under different conditions. Under acidic conditions, the reaction is represented as Cr + 3H2O → Cr(OH)3 + 3e- + 3H+, resulting in the formation of chromium ions (Cr3+). In basic conditions, chromium hydroxide (Cr(OH)3) is produced, with hydroxide ions (OH-) acting as reactants. It is important to note that chromium is often passivated by oxides, complicating its reactivity with water.

PREREQUISITES
  • Understanding of redox reactions
  • Knowledge of acid-base chemistry
  • Familiarity with chromium chemistry
  • Basic principles of passivation in metals
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  • Research the electrochemical properties of chromium
  • Study the passivation process in metals
  • Learn about the behavior of metals in acidic and basic solutions
  • Explore the formation and properties of chromium hydroxide
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Chemists, materials scientists, and students studying inorganic chemistry or metal reactivity will benefit from this discussion.

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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
 
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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.
 
thanks
 

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