15 Facts about H2SO4 + Na2O2: How This Combination Works

Sodium peroxide, an inorganic compound reacts with strong mineral acid sulfuric acid. Let us now discuss the reaction between: H2SO4 + Na2O2.

Sodium peroxide (Na2O2), a yellowish coloured inorganic salt exist in various forms of hydrates. It acts as a strong base. Sulfuric acid(H2SO4) is a colourless acid which one of the strongest mineral acid that is highly corrosive in nature when concentrated.

In this article, we will talk about the reaction between H2SO4 and Na2O2 and discuss about various facts about this reaction such as type of reaction, product of the reaction, balanced chemical equation, conjugate pairs etc.

What is the product of H2SO4 + Na2O2?

Sodium sulphate (Na2SO4) and hydrogen peroxide (H2O2) are obtained as products of the reaction between H2SO4 and Na2O2.

H2SO4 + Na2O2 = Na2SO4 + H2O2

What type of reaction is H2SO4 + Na2O2?

The reaction between H2SO4 and Na2O2 is a metathesis reaction or, simply known as double displacement reaction.

How to balance H2SO4 + Na2O2?

The reaction H2SO4 + Na2O2 = Na2SO4 + H2O2 is not balanced.

The following steps are followed for balancing the equation:

  • The unknown coefficients of the reactants and the products are labeled by a, b, c, and d variables.
  • aH2SO4 + bNa2O2 = cNa2SO4 + dH2O2
  • The coefficients are equated after rearranging the same type of elements according to their stoichiometric proportions.
  • Na=2a=2c; O=2a=4b=4c=2d; H=2b=2d; S=b=c
  • Next we use the Gaussian elimination method to find the values of these coefficients
  • We get a=1 , b=1 , c=1 , d=1
  • Thus  the overall balanced equation is:
  • H2SO4 + Na2O2 = Na2SO4 + H2O2

H2SO4 + Na2O2 titration

The H2SO4 and Na2O2 titration is a strong acid-base titration, in which H2SO4 is a strong acid and Na2O2 is a strong base. The process of titration is mentioned below:

Apparatus Used

  • Burette
  • Pipette
  • Conical flask
  • Volumetric flask
  • Glass rod


The indicator used in this titration: Phenolphthalein.


  • Sodium peroxide solution is prepared by dissolving it in water.
  • Two solutions of H2SO4 and NaOH are prepared of known concentration
  • Then the burette is filled with the prepared NaOH solution.
  • Next an unknown amount of Sodium peroxide was dissolved completely in excess of prepared sulfuric acid in a conical flask.
  • A few drops of Phenolphthalein was added to the H2SO4 solution in the conical flask and then titrated by adding NaOH drop wise from the burette to the conical flask and then the end point was recorded.
  • The excess H2SO4 present in the flask is calculated from the amount of NaOH used using the formula: V1S1=V2S2, where V is the volume of the respective acid and base and S is the strength of the acid and base.

H2SO4 + Na2O2 net ionic equation

The net ionic equation for H2SO4 + Na2O2 is:

Na2O2(s) = Na+ (aq.) + H+ (aq.) + 2O(aq.)

The following steps are followed to get the ionic equation:

  • First the chemical states are indicated for the elements in the reaction
  • H2SO4 (aq.)+ Na2O2 (s)= Na2SO4 (aq.)+ H2O2 (aq.)
  • The aqueous compounds are split into their corresponding ions:
  • H+ (aq.)+SO42- (aq.)+ Na2O2(s)= Na+ (aq.)+ SO42- (aq.) + 2H+  (aq.) + 2O(aq.)
  • The common ions on either side cancels each other.
  • H+ (aq.) +SO42- (aq.) + Na2O2(s) = Na+ (aq.) + SO42- (aq.) + 2H+ (aq.) + 2O(aq.
  • Hence the net ionic equation is:
  • Na2O2(s)= Na+ (aq.)+ H+  (aq.) + 2O(aq.)

H2SO4 + Na2O2 conjugate pairs

H2SO4 and Na2O2 have the following conjugate pairs:

  • The conjugate base of H2SO4 is HSO4- .
  • The conjugate acid of Na2O2 is Na+.

H2SO4 + Na2O2 intermolecular forces

The intermolecular forces in H2SO4 and Na2O2 are:

  • Strong van der Waals forces and dipole-dipole interaction are the forces present in H2SO4 molecule.
  • Na2O2 has strong intermolecular force of attraction between the ions since it is an ionic compound.

H2SO4 + Na2O2 reaction enthalpy

H2SO4 + Na2O2 reaction enthalpy is -244.89 KJ/mol.

Table for enthalpy
  • The formula for enthalpy calculation is = Enthalpy of Product – Enthalpy of Reactant
  • = [-1384.48-187.77] – [-513.37-813.99] KJ/mol
  • = -244.89  KJ/mol

Is H2SO4 + Na2O2 a buffer solution?

H2SO4 + Na2O2 cannot form a buffer solution since strong acid i.e, H2SO4 and strong base i.e, Na2O2 are present, whereas buffer solutions require weak acids and bases in them.

Is H2SO4 + Na2O2 a complete reaction?

H2SO4 + Na2O2 is a complete reaction because at the end of the reaction, sodium sulfate and hydrogen peroxide are obtained as the products.

Is H2SO4 + Na2O2 an exothermic or endothermic reaction?

The reaction H2SO4 + Na2O2 is an exothermic in nature, since we get a negative enthalpy value of -244.89 KJ/mol at the end of the reaction.

Is H2SO4 + Na2O2 a redox reaction?

H2SO4 + Na2O2 is not a redox reaction since the oxidation states of the elements remains unchanged even after completion of the reaction as shown below, where the roman numbers in the superscript represent the oxidation states.

H2IS VIO4-II + Na2 IO2 -I = Na2IS VIO4-II + H2IO2-I

Is H2SO4 + Na2O2 a precipitation reaction?

H2SO4 + Na2O2 is not a precipitation reaction because no precipitate is obtained at the end of the reaction.

Is H2SO4 + Na2O2 reversible or irreversible reaction?

H2SO4 + Na2O2 is an irreversible reaction because the products sodium sulfate and hydrogen peroxide formed at the end of the reaction does not react back to give the reactants.

Is H2SO4 + Na2O2 displacement reaction?

The reaction H2SO4 + Na2O2 is a double displacement reaction or metathesis.  In this reaction, H+ and SO42- exchange their positions with Na+ and O respectively to form entirely different products i.e, sodium sulphate (Na2SO4 ) and hydrogen peroxide(H2O2).

Double displacement reaction


Sodium peroxide is a yellow-white granular substance that reacts with strong mineral acid H2SO4 to produce sodium sulfate(Na2SO4 ) and hydrogen peroxide (H2O2) as the products.