kmno4 h2so4

KMnO4 is a strong oxidizing agent and can react with molecules having higher reduction potential. Let us see in detail the mechanism of its reaction with H2SO4.

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Potassium permanganate is a purple violate solid molecule and it is a powerful reagent as the central metal Mn presents a +7 oxidation state. It can react with a cold and concentrated khuông of sulfuric acid and khuông different oxidized products. In this reaction, KMnO4 acts as a self catalyst.

Let us discuss the mechanism of the reaction between sulfuric acid and iron, the reaction enthalpy, the type of reaction, product formation, etc in the following part of the article.

1. What is the product of H2SO4 and KMnO4?

Manganese sulfate and Potassium sulfate are formed as major products when H2SO4 and KMnO4 are reacted together. Water molecules and oxygen gas are also evolved due đồ sộ their reaction.

Product of the reaction
between H2SO4 and KMnO4

2. What type of reaction is H2SO4 + KMnO4?

H2SO4 + KMnO4 reaction is an example of a double displacement reaction along with redox and precipitation reactions. It is also oxygen evolved reaction along with a hydrolysis reaction.

3. How đồ sộ balance H2SO4 + KMnO4?

H2SO4 + KMnO4 = MnSO4 + K2SO4 + H2O + O2 We have đồ sộ balance the equation in the following way:

  • Step 1 – Labelling all the reactants and products by the required number of alphabets
  • First, we labeled all the reactants and products by A, B, C, D, and E as there are only five different atoms obtained for this reaction and the reaction looks like: A H2SO4 + B KMnO4 = C MnSO4 + D K2SO4 + E H2O + F O2
  • Step 2 – Equating all the Coefficients for all the same type of elements by rearranging them
  • After the rearrangement of all the coefficients of the same elements by their stoichiometric proportion we get, H = 2A = 2E, S = A = C = D, O = 4A = 4B = 4C = 4 chiều = E =2F, Mn = B = C, K = B = 2d
  • Step 3 – Using Gaussian elimination đồ sộ determine the coefficient values
  • Using the Gaussian elimination and equating all the equations we get, A = 6, B = 4, C = 4, D = 2, E = 6, and F= 5,
  • Step 4- now write the whole equation in the balanced form
  •  The overall balanced equation will be,
  • 6 H2SO4 + 4 KMnO4 = 4 MnSO4 + 2 K2SO4 + 6 H2O + 5 O2

4. H2SO4 + KMnO4 titration

To estimate the quantity of potassium or manganese we can perform a titration between KMnO4 and H2SO4

Apparatus used

We need a burette, conical flask, burette holder, volumetric flask, and beakers for this titration.

Titre and titrant

H2SO4 versus KMnO4, H2SO4 acts as a titrant which is taken in the burette and the molecule đồ sộ be analyzed is KMnO4 which is taken in a conical flask.


The whole titration is done in acidic pH as the concentration of H2SO4 is high and for this reaction, KMnO4 acts as a self-indicator because it is a colored solution and in different pH, it changes color.


The burette was filled with standardized H2SO4 and KMnO4 was taken in a conical flask along with the respective indicator. H2SO4 is added dropwise đồ sộ the conical flask and the flask was shaking constantly. After a certain time when the endpoint arrived KMnO4 changes its color.

We repeat the titration several times for better results and then we estimate the potassium as well as manganese quantity by the formula V1S= V2S2.

5. H2SO4+ KMnO4 net ionic equation

The net ionic equation between H2SO4 + KMnO4 is as follows,

2H+ + SO42- + K+ + MnO4 = Mn2+ + K+ + SO42- + H+ + OH + O2

  • To derive the net ionic equation the following steps are required,
  • First H2SO4 will be ionized in proton and sulfate ions as it is a strong electrolyte
  • After that KMnO4 also dissociated đồ sộ K+ ion and SO42-.
  • After that, the product MnSO4 also dissociated đồ sộ Mn2+ which is d5 stable configuration and corresponding SO42-.
  • Water is also ionized đồ sộ H+ and OH-.
  • O2 remains undissociated.

6. H2SO4+ KMnO4 conjugate pairs

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In the reaction, H2SO4 + KMnO4 conjugate pairs will be the corresponding de-protonated and protonated khuông of that particular species which are listed below-

  • Conjugate pair of H2SO4 = SO42-
  • Conjugate pair of OH = H2O

7. H2SO4 and KMnO4 intermolecular forces

The intermolecular force between H2SO4 is an electrostatic, covalent force. For the KMnO4 it is ionic interaction and for MnSO4 and K2SO4 the ionic interaction is along with the coulombic force. H-bonding is present in water and cầu xin der waal’s force acts in O2 molecules.

van der waal’s
KMnO4Ionic, metallic, and
K2SO4 / MnSO4Coulombic force,
strong ionic interaction
O2Van der Waal’s force,
London force
Intermolecular Forces

8. H2SO4 + KMnO4 reaction enthalpy

In the reaction, H2SO4 + KMnO4 reaction enthalpy is,-4400.4 KJ/mol which can be obtained by the formula enthalpy of products – enthalpy of reactants, and here the change in enthalpy is positive.

Enthalpy of Reactants
and Products

9. Is H2SO4 + KMnO4 a buffer solution?

The reaction between H2SO4 + KMnO4 gives a buffer solution and they can control the pH of the solution.

10. Is H2SO4 + KMnO4 a complete reaction?

The reaction between H2SO4 + KMnO4 is the complete reaction because it gives two complete products MnSO4 and K2SO4 along with O2 gas.

11. Is H2SO4 + KMnO4 an exothermic or endothermic reaction?

The reaction H2SO4 + KMnO4 is exothermic in terms of thermodynamics first law. So, the reaction releases more energy and temperature đồ sộ the surrounding ví we have đồ sộ be more cautious, Where δH is always negative.

12. Is H2SO4 + KMnO4 a redox reaction?

The reaction between H2SO4 + KMnO4 is a redox reaction because in this reaction many elements get reduced and oxidized.

Redox Schematic of the
H2SO4 and KMnO4 Reaction

13. Is H2SO4 + KMnO4 a precipitation reaction

The reaction H2SO4 + KMnO4 is a precipitation reaction because it gets precipitated in the solution and is not soluble in the reaction mixture.

14. Is H2SO4 + KMnO4 reversible or irreversible reaction?

The reaction between H2SO4+ KMnO4 is irreversible because we get O2 gas as a product. When gas is formed during the reaction, the entropy of the reaction increases and the equilibrium of the reaction shifts towards the right-hand side only.

15. Is H2SO4 + KMnO4 displacement reaction?

The reaction between H2SO4+ KMnO4 is an example of single displacement reaction because in the above reaction Mn and K are displaced by H+ in H2SO4  and O2 gas becomes không tính tiền from the reaction.

Single Displacement Reaction


H2SO4 and KMnO4 reaction mainly gives us K2SO4 and MnSO4 along with oxygen gas ví it is a commercially important reaction for the production of oxygen gas. Also, the quantitative analysis of the H2SO4 and KMnO4 give the amount of Mn and K in the respective sample.

Read more about 11 Facts on H2SO4 + Al(OH)3.

Read more facts on H2SO4:

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H2SO4 + KClO3
H2SO4 + NaH
H2SO4 + NaOCl
H2SO4 + K2S
H2SO4 + MnO2
H2SO4 + Mn2O7
H2SO4 + Mg
H2SO4 + Na2CO3
H2SO4 + Sr(NO3)2
H2SO4 + MnS
H2SO4 + NaHSO3
H2SO4 + CaCO3
H2SO4 + Sn
H2SO4 + Al2O3
H2SO4 + SO3
H2SO4 + H2O
H2SO4 + Fe2S3
H2SO4 + Li3PO4
H2SO4 + Na2HPO4
H2SO4 + Zn(OH)2
H2SO4 + BeO
H2SO4 + Li2O
H2SO4 + K2Cr2O7
H2SO4 + NaOH
H2SO4+ Ag
H2SO4 + Mn3O4
H2SO4 + NaH2PO4
H2SO4 + Sr
H2SO4 + Zn
H2SO4 + Pb(NO3)2
H2SO4 + Na
H2SO4 + Ag2S
H2SO4 + BaCO3
H2SO4 + PbCO3
H2SO4 + Sr(OH)2
H2SO4 +Mg3N2
H2SO4 + LiOH
H2SO4 + Cl2
H2SO4 + Be
H2SO4 + Na2S
H2SO4 + Na2S2O3
H2SO4 + As2S3
H2SO4 + Fe(OH)3
H2SO4 + Al(OH)3
H2SO4 + NaI
H2SO4 + K2CO3
H2SO4 + NaNO3
H2SO4 + CuO
H2SO4 + Fe2O3
H2SO4 + AgNO3
H2SO4 + Al
H2SO4 + K2SO4
H2SO4 + Ba
H2SO4 + MnCO3
H2SO4 + K2SO3
H2SO4 + PbCl2
H2SO4 + P4O10
H2SO4 + NaHCO3
H2SO4 + O3
H2SO4 + Ca(OH)2
H2SO4 + Be(OH)2
HCl + H2SO4
H2SO4 + FeCl2
H2SO4 + ZnCl2
H2SO4 + Al2(SO3)3
H2SO4 + KMnO4
H2SO4 + CH3NH2
H2SO4 + Pb
H2SO4 + Fe2(CO3)3
H2SO4 + Li2CO3
H2SO4 + MgO
H2SO4 + Na2O
H2SO4 + F2
H2SO4 + Zn(NO3)2
H2SO4 + Ca
H2SO4 + K2O
H2SO4 + Mg(OH)2
H2SO4 + Sb2S3
H2SO4 + NH4NO3
H2SO4 + AlBr3
H2SO4 + CsOH
H2SO4 + BaSO3
H2SO4 + AlCl3
H2SO4 + AlPO4
H2SO4 + Li2SO3
H2SO4 + Fe
H2SO4 + Cu
H2SO4 + PbS
H2SO4 + P2O5
H2SO4 + CuCO3
H2SO4 + Li
H2SO4 + K2CrO4
H2SO4 + NaCl
H2SO4 + Ag2O
H2SO4 +Mg2Si
H2SO4 + Mn(OH)2
H2SO4 + K
H2SO4 + CaCl2
H2SO4 + Li2S
H2SO4 + SrCO3
H2SO4 + H2O2
H2SO4 + CuS
H2SO4 + KBr
H2SO4 + Fe3O4
H2SO4 + Fe3O4
H2SO4 + KI