Question

Balance the following skeleton reactions and identify the oxidizing and reducing agents:(b) CrO₄²⁻(aq) + Cu(s) → CrOH₃(s) + CuOH₂(s)

Answer 1

The balanced skeleton reactions are given below

2CrO₄²⁻(aq) + 3Cu(s)  +8$H_{2} O$(l) → 2Cr(OH)₃(s) + 3Cu(OH)₂(s) + 6$OH^{-}$(aq)

The oxidising agent and  reducing agents are Cr and  Cu .

There are following steps involve in balance redox reaction in basic medium .

• First divide the reaction into two half reactions which give oxidation and reduction half reaction.

• Then balance the elements other than oxygen and hydrogen atom.

• Balance the oxygen atom by adding $H_{2} O$ where number of oxygen is less .

• Balance the hydrogen atom by adding $H^{+}$ on another side of where water molecule added.
• Add $OH^{-}$ ions to both sides to neutralize  $H^{+}$ ion.
• Combine  $H^{+}$ and $OH^{-}$ ion to make $H_{2} O$ .

• Balance the charge by adding $e^{-}$ .

• Add the half reaction  .

The species which reduces the other species in the redox reaction is called oxidizing agent . Similarly , the species which oxidize the other species in the redox reaction  is called reducing agent .

To learn more about reducing agents please click here ,

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