13 Facts on H2SO3 + CuO: What, How To Balance & FAQs

Copper (II) oxide (CuO) is an organic compound commonly obtained during copper mining. Let us see how H2SO3 and CuO react with each other in this article.

H2SO3 and CuO react to form salt and water. Sulfurous acid (H2SO3) is an acidic chemical that generally occurs as an intermediate during acid rain. It is slightly less acidic than H2SO4 and not a strong electrolyte. CuO is a mineral with the common name tenorite.

We will discuss some useful facts about H2SO3 + CuO reactions, like the type of reaction, balanced chemical equation and reaction enthalpy through this article.

What is the product of H2SO3 and CuO

Copper (II) sulfite and water (H2O) are the products of H2SO3 and CuO. the chemical equation for this reaction is,

H2SO3 + CuO = CuSO3 + H2O

What type of reaction is H2SO3 + CuO

H2SO3 + CuO reaction is a neutralization reaction. H2SO3 is a weak acid and CuO is a weak base when combined, it produces CuSO3 salt and H2O. 

How to balance H2SO3 + CuO

The balanced chemical equation for H2SO3 + CuO reaction is,

H2SO3 + CuO = CuSO3 + H2O

  • The unbalanced equation for H2SO3 + CuO reaction is, 
  • H2SO3 + CuO = CuSO3 + H2O
  • To check if the number of atoms present on both sides of the equation is equal or not.
  • In our case, the atoms are equal on both sides: therefore, the reaction is already balanced.
  • Thus, the balanced chemical equation is,
  • H2SO3 + CuO = CuSO3 + H2O

H2SO3 + CuO titration

The titration between H2SO3 and CuO cannot be processed because both the compounds are weak electrolytes and do not ionize completely. Thus, no suitable indicator is available for determining the endpoint of the titration.

H2SO3 + CuO net ionic equation

The net ionic equation for H2SO3 + CuO reaction is,

H2SO3 (aq.) + CuO (aq.) = CuSO3 (s) + H2O (l)

  • Write the general balanced equation.
  • H2SO3 + CuO = CuSO3 + H2O
  • Indicate the chemical states of compounds involved in the reaction to obtain the total ionic equation.
  • H2SO3 (aq.) + CuO (aq.) = CuSO3 (s) + H2O (l)
  • Split the strong electrolytes into their respective ions. Here no molecule is a strong electrolyte; therefore, the net ionic equation is,
  • H2SO3 (aq.) + CuO (aq.) = CuSO3 (s) + H2O (l)

H2SO3 + CuO conjugate pairs

H2SO3 + CuO reaction has the following conjugate pairs,

  • Conjugate pair of H2O is its conjugate base OH.
  • The conjugate pair of H2SO3 is its conjugate base HSO3.

H2SO3 and CuO intermolecular forces

H2SO3 + CuO reaction has the following intermolecular forces,

  • H2O molecules contain dipole-dipole interaction and hydrogen bonding.

Is H2SO3 + CuO a buffer solution

H2SO3 + CuO is not a buffer solution because there is no conjugate acid for sulfurous acid.

Is H2SO3 + CuO a complete reaction

H2SO3 + CuO reaction is a complete reaction and no further steps are left in the reaction.

Is H2SO3 + CuO a redox reaction

The H2SO3 + CuO reaction is not a redox reaction as the oxidation states of atoms present in the chemical equation are unchanged.

Is H2SO3 + CuO a precipitation reaction

H2SO3 + CuO reaction is a precipitation reaction and white precipitates of CuSO3 are obtained.

Is H2SO3 + CuO reversible or irreversible reaction

H2SO3 + CuO reaction is an irreversible reaction because the CuSO3 precipitates do not dissolve back to obtain the reactants back.

Is H2SO3 + CuO displacement reaction

H2SO3 + CuO is a double displacement reaction in which Cu and H2 displace each other from their respective molecules to form new products.


This article concludes that Copper (II) oxide (CuO) reacts with acids to produce corresponding salts. It is also used to provide colours in ceramics. H2SO3 is only intermediate and tries to be stable by the further reaction.