Respuesta :
Answer :
Ethanol [tex](C_2H_5OH)[/tex] act as reducing agent.
The smallest possible integer coefficient of [tex]MnO_4^-[/tex] in the combined balanced equation is, 4
Explanation :
Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.
Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.
Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.
Reducing agent : It is defined as the agent which helps the other substance to reduce and itself gets oxidized. Thus, it will undergo oxidation reaction.
Oxidizing agent : It is defined as the agent which helps the other substance to oxidize and itself gets reduced. Thus, it will undergo reduction reaction.
The given chemical reaction is,
[tex]C_2H_5OH(aq)+MnO_4^-(aq)\rightarrow CH_3COOH(aq)+Mn^{2+}(aq)[/tex]
The oxidation-reduction half reaction will be :
Oxidation : [tex]C_2H_6O\rightarrow C_2H_4O_2[/tex]
Reduction : [tex]MnO_4^-\rightarrow Mn^{2+}[/tex]
- Now balance oxygen atom on both side.
Oxidation : [tex]C_2H_6O+H_2O\rightarrow C_2H_4O_2[/tex]
Reduction : [tex]MnO_4^-\rightarrow Mn^{2+}+4H_2O[/tex]
- Now balance hydrogen atom on both side.
Oxidation : [tex]C_2H_6O+H_2O\rightarrow C_2H_4O_2+4H^+[/tex]
Reduction : [tex]MnO_4^-+8H^+\rightarrow Mn^{2+}+4H_2O[/tex]
- Now balance the charge.
Oxidation : [tex]C_2H_6O+H_2O\rightarrow C_2H_4O_2+4H^++4e^-[/tex]
Reduction : [tex]MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O[/tex]
In order to balance the electrons, we multiply the oxidation reaction by 5 and reduction reaction by 4 and then added both equation, we get the balanced redox reaction.
Oxidation : [tex]5C_2H_6O+5H_2O\rightarrow 5C_2H_4O_2+20H^++20e^-[/tex]
Reduction : [tex]4MnO_4^-+32H^++20e^-\rightarrow 4Mn^{2+}+16H_2O[/tex]
The balanced chemical equation in acidic medium will be,
[tex]5C_2H_6O+4MnO_4^-+12H^+\rightarrow 5C_2H_4O_2+4Mn^{2+}+11H_2O[/tex]
In the redox reaction ethanol act as reducing agent and permanganate ion act as an oxidizing agent.
