H2SO4 is a strong acid and it can react with many more transition metals. Let us see the mechanism behind the reaction H2SO4 + Fe.

Iron is placed higher postion in electrochemical series kêu ca hydrogen, ví it has higher reduction potential. Sulfuric acid is one of strong mineral inorganic acids and also a powerful oxidizing agent. Sulfuric acid has a greater affinity with water molecule and produce heat when it reacts with water.

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To estimate the quantity of iron we can perform the reaction between Fe and H2SO4 or estimate the quantity of sulfate also. 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 Fe?

Ferrous sulfate is a major product formed when H2SO4 and Fe are reacted together and hydrogen gas is liberated. Fe is present in a higher position kêu ca hydrogen in the electrochemical series ví the corresponding sulfate is formed.

Product of the Reaction between H2SO4 + Fe

2. What type of reaction is H2SO4 + Fe?

H2SO4 + Fe reaction is an example of a single displacement reaction along with redox and precipitation reactions. Here higher reduction potential element reacted with the acid molecule.

3. How vĩ đại balance H2SO4 + Fe?

H2SO4 + Fe = FeSO4 + H2 this reaction is not balanced by the oxidation number because iron shows different valency which is not equal for the left side and right side. We have vĩ đại 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, and D as there are only four molecules obtained for this reaction and the reaction looks like: A H2SO4 + B Fe = C FeSO4 + D H2  
  • 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 = 2 chiều, S = A = C, O = 4A = 4C, Fe = B = C
  • Step 3 – Using Gaussian elimination vĩ đại determine the coefficient values
  • Using the Gaussian elimination and equating all the equations we get, A = 1, B = 1, C = 1, and D = 1, ví the oxidation number of Fe is +2 on both sides.
  • Step 4- now write the whole equation in the balanced form
  •  The overall balanced equation will be,

H2SO4 + Fe = FeSO4 + H2

4. H2SO4 + Fe titration

To estimate the quantity of sulfur or copper, we can perform a titration between Fe and H2SO4

Apparatus used

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

Titre and titrant

H2SO4 versus Fe, H2SO4 acts as a titrant which is taken in the burette and the molecule vĩ đại be analyzed is Fe which is taken in a conical flask.


The whole titration is done in an acidic medium or acidic pH ví the best suitable indicator will be phenolphthalein which gives perfect results for this titration at given pH.


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

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

5. H2SO4+ Fe net ionic equation

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

Xem thêm: ca(no3)2 + na2co3

2H+ + SO42- + Fe2+ + 2e = Fe2+ + SO42- + H2

6. H2SO4+ Fe conjugate pairs

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

  • Conjugate pair of H2SO4 = SO42-
  • Conjugate pair of H = H2

7. H2SO4 and Fe intermolecular forces

The intermolecular force present in H2SO4 is due vĩ đại the strong electrostatic force between proton and sulfate ions. Also due vĩ đại polarity, nài der waal’s attraction is present but in the case of H2, covalent force, as well as dipole interaction is present, and for FeSO4 only covalent force is present.

van der waal’s
FeCovalent, metallic
FeSO4Columbia force,
ionic interaction
Intermolecular Forces

8. H2SO4 + Fe reaction enthalpy

In the reaction, H2SO4 + Fe reaction enthalpy is,+131.34 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 + Fe a buffer solution?

The reaction between H2SO4 + Fe gives a buffer solution of FeSO4 and H2 and they can control the pH of the reaction.

10. Is H2SO4 + Fe a complete reaction?

The reaction H2SO4 + Fe is the complete reaction because it gives one complete product FeSO4 along with H2 gas. The reaction takes need some time vĩ đại complete until all the reactants completely reacted the products are not formed.

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

The reaction H2SO4 + Fe is endothermic in terms of thermodynamics first law. So, the reaction takes more energy and temperature from the surroundings which help vĩ đại complete the reaction, Where δH is always positive.

12. Is H2SO4 + Fe a redox reaction?

H2SO4 + Fe reaction is a redox reaction because in this reaction many elements get reduced and oxidized as hydrogen gets reduced and Fe gets oxidized.

Redox Schematic of the
H2SO4 and Fe Reaction

13. Is H2SO4 + Fe a precipitation reaction

The reaction H2SO4 + Fe is a precipitation reaction because FeSO4 gets precipitated in the solution and is not soluble in the reaction mixture.

14. Is H2SO4 + Fe reversible or irreversible reaction?

The reaction between H2SO4+ Fe is irreversible because we get H2 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.

Xem thêm: hcoonh3ch3 + naoh

Irreversible Reaction Direction

15. Is H2SO4 + Fe displacement reaction?

The reaction between H2SO4+ Fe is an example single displacement reaction because in the above reaction Fe2+ displaced H+ in H2SO4 only and H2 gas becomes không tính phí from the reaction.

Single Displaemnet Reaction


H2SO4 and Fe reaction mainly gives us ferrous sulfide along with hydrogen gas ví it is a commercially important reaction for the production of hydrogen gas. Also, the quantitative analysis of the H2SO4 and Fe gives the amount of iron as well as sulfate in the respective sample.

Read more facts on H2SO4:

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 + Na2S2O3
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 + As2S3
H2SO4 + Al2(SO3)3
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 + 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