k2o h2so4

Potassium oxide (K2O) is the simplest oxide of potassium with a pale-yellow colour. Let us discuss how K2O reacts with H2SO4 in this article.

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H2SO4 and K2O neutralise each other to tát generate a salt and release water. Sulphuric acid (H2SO4) is a powerful dehydrating agent of organic chemistry. It is a colourless and odourless viscous liquid. Potassium oxide (K2O) is a highly reactive ionic compound with a basic character.

We will discuss many important facts about the H2SO4 + K2O reaction, lượt thích enthalpy of formation, type of reaction and products in this article.

What is the product of H2SO4 and K2O

Potassium sulphate (K2SO4) and Water (H2O) are the products of H2SO4 and K2O reactions. The chemical equation for this reaction is:

K2O + H2SO4 = K2SO4 + H2O

What type of reaction is H2SO4 + K2O

H2SO4 + K2O reaction is an acid-base (neutralisation) reaction. Here H2SO4 is acid and K2O is a base.

How to tát balance H2SO4 + K2O

The balanced chemical equation for H2SO4 + K2O reaction is,

K2O + H2SO4 = K2SO4 + H2O

  • The general chemical equation for the above reaction is,
  • K2O + H2SO4 = K2SO4 + H2O
  • Check if the number of atoms present on both sides of the chemical equation is equal or not.
  • Here the number of atoms is equal. Therefore, the equation is already balanced.
  • Thus, the balanced chemical equation is,
  • K2O + H2SO4 = K2SO4 + H2O

H2SO4 + K2O titration

H2SO4 + K2O titration is an acid-base titration. Concentration of Sulphuric acid can be determined using the procedure mentioned below:

Apparatus Used:

Burette, conical flask, beaker, burette stand, pipette.


Phenolphthalein is the indicator used for strong acid-strong base titration. 


  • Wash and rinse the burette with a standardised solution of K2O and fit it in a burette stand.
  • Pipette out 10mL of H2SO4 in the conical flask and add 2-3 drops of phenolphthalein to tát it.
  • Start adding the K2O solution to tát the conical flask in a dropwise manner.
  • The colour of the solution will change from colourless to tát light pink when the endpoint is reached.
  • Repeat the above steps to tát get concurrent readings.
  • Contraction of sulphuric acid is found using the formula SH2SO4VH2SO4 = SK2OVK2O.

H2SO4 + K2O net ionic equation

H2SO4 + K2O net ionic equation is,

2H+ (aq.) + O2- (aq.) = H2O (l)

  • Write the general balanced chemical equation of H2SO4 + K2O.
  • K2O + H2SO4 = K2SO4 + H2O
  • Display the chemical state of every compound involved during the reaction
  • K2O (aq.) + H2SO4 (aq.) = K2SO4 (aq.) + H2O (l)
  • Split the strong electrolytes into their respective ions having positive and negative charges.
  • 2H+ (aq.) + SO42- (aq.) + 2K+ (aq.) + O2- (aq.) = 2K+ (aq.) + SO42- (aq.) + H2O (l)
  • Eliminate the spectator ions to tát obtain the net ionic equation.
  • 2H+ (aq.) + O2- (aq.) = H2O (l)

H2SO4 + K2O conjugate pairs

The pair of H2SO4 + K2O itself does not have any conjugate pair.

  • H2SO4 and HSO4 size a conjugate acid-base pair.
  • The conjugate pair of H2O contains its conjugate base OH.

H2SO4 + K2O intermolecular forces

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H2SO4 + K2O reaction has the following intermolecular forces,

  • The intermolecular forces in H2O molecules are dipole-dipole interaction and intramolecular hydrogen bonding.
  • H2SO4 contains London dispersion forces, dipole-dipole interaction and hydrogen bonding between their molecules.
  • Ionic bonding is present in K2SO4 because it is an ionic compound.

H2SO4 + K2O reaction enthalpy

H2SO4 + K2O reaction enthalpy is -427.4 kJ/mol. The standard enthalpy of formation of compounds involved in the reaction is:

MoleculesReaction enthalpy (in kJ/mol)
Reaction enthalpy of compounds

Reaction Enthalpy ΔHf = Standard enthalpy of products – Standard enthalpy of reactants

Thus, ΔHf = (-1161.65 – 285.83) – (-909.27 – 363.17)

ΔHf = -427.4 kJ/mol.

Is H2SO4 + K2O a buffer solution

H2SO4 + K2O is not a buffer solution because H2SO4 is a strong acid and we need a weak acid for a solution to tát act as a buffer solution.

Is H2SO4 + K2O a complete reaction

H2SO4 + K2O is a complete reaction and no further steps are left to tát proceed.

Is H2SO4 + K2O an exothermic or endothermic reaction

H2SO4 + K2O is an exothermic reaction because the reaction enthalpy has a negative value for the given chemical equation.

Exothermic reaction graph

Is H2SO4 + K2O a redox reaction

H2SO4 + K2O is not a redox reaction because the oxidation state of atoms involved in the reaction remains unchanged throughout the chemical process.

Is H2SO4 + K2O a precipitation reaction

H2SO4 + K2O is not a precipitation reaction as no solid product is obtained at the kết thúc of the process.

Is H2SO4 + K2O reversible or irreversible reaction

H2SO4 + K2O is an irreversible reaction because the heat released during the process cannot be reverted back to tát the reaction mixture. 

Is H2SO4 + K2O displacement reaction

H2SO4 + K2O is a double displacement reaction in which H2 and K2 displace each other from their respective compounds to tát size new products.


This article concludes that H2SO4 and K2O neutralise each other completely and size the corresponding salt. H2SO4 is acidic and has several laboratory and industrial importance. K2O is one of the strongest bases known till now.

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