15 Facts on HCl + H2CO3: What, How To Balance & FAQs

HCl and H2CO3 are the chemical compounds present in an aqueous medium, and hydrochloric acid and carbonic acid reacts easily and the final product is chlorine and carbon monoxide. Let us discuss  HCl and H2CO3 reactions.

HCl acid is also referred as muriatic acid.In appearance, it seems to be colorless, and it’s molar mass is equal to 36.458 g/mol. H2CO3 is a chemical compound used in food industry for fermentation process as it is a weak base and less reactive.

In the following sections, we will study many facts about based on HCl + H2CO3 reactions. The product obtained , conjugate pairs, etc.

What is the product of HCl and

HCl is a strong acid that dissociates completely, and H2CO3 is a weak base and partially dissociated in the water so, the reaction will be,

HCl + H2CO3 = Cl2 + CO + H2O

What type of reaction is HCl + H2CO3

The reaction of HCl + H2CO3 is known as a double displacement reaction because in the product the positive ion and negative ions are switching their places and form two products that are very different from each other.

How to balance HCl + H2CO3

The following steps are there to balance a chemical reaction:-

  • Step 1: As the coefficients are 5, label all the reactants and products A, B, C, D, and E
  • A HCl +B H2CO3 =C Cl2 +D CO + E H2O
  • Step 2 – modify the equation with a suitable number; the coefficients are already labeled as alphabets for product and reactants.
  • 2H –> A= B= E, Cl = C , D = C
  • Step 3: Multiplying the coefficients of the atoms in the reaction
  • A = 2 , C = 1, D = 1
  • Step 4 : Reduce the result of lowest integer values as a result, the balanced equation is:
  • 2HCl + H2CO3 = Cl2 +CO +2H2O

HCl +H2CO3 titration

The titration of HCl + H2CO3 is not possible because of the acidic nature of both chemical compounds though, H2CO3 is a weak acid it is not possible to calculate the endpoint of the reaction as the formation of gasses like carbon monoxide and chlorine takes place.

HCl +H2CO3 net ionic equation

To write the net ionic equation of HCl + H2CO3 first complete reaction with the respective states is to be written

HCl(l) + H2CO3(l) = Cl2(g) + CO(g) + H2O(l)

Now, split the compounds into ions –

H+ + Cl + H+ + CO = Cl + CO + HOH

 The remaining HOH can be written as H+ and OH.

HCl and H2CO3 intermolecular forces

  • The HCl compound is bounded by two intermolecular forces that are dipole-dipole interaction and London dispersion force.
  • The H2CO3 compound has hydrogen bonds with Van der Waal’s force of attraction because of covalent bonds.

HCl + H2CO3 conjugate pairs

HCl acid has the conjugate base of Cl and H2CO3 acid has the conjugate base of HCO3- because both the reactants are acids and the formation of base as product takes place as HCl donates a proton converts to Cl to become conjugate acid and H2CO3 donates a proton converts to HCO3-.

Conjugate acid-base pairs

HCl + H2CO3 reaction enthalpy

The reaction enthalpy of HCl + H2CO3 is zero because One is a strong acid and the other is weak acid both can react easily because of the same nature and no amount of external energy is required to complete the reaction.

Is HCl + H2CO3 a buffer solution

The HCl + H2CO3 is not a buffer solution because both are acidic chemical compounds which make the solution more acidic and H2CO3 is highly unstable and ideally converts into the gas of carbon monoxide.

Is HCl + H2CO3 a complete reaction

The HCl + H2CO3 is a complete reaction because of the exchange of cations and anions complete product is formed in the form of gasses of chlorine and carbon monoxide.

Is HCl + H2CO3 an exothermic or endothermic reaction

The reaction of HCl + H2CO3 is an exothermic reaction which means the Cl2 and CO both compound releases a good amount of heat with gasses as well.

Is HCl + H2CO3 a redox reaction

HCl + H2CO3 is not a redox reaction because the oxidation and reduction of the chemical compounds do not take place simultaneously, but in this reaction the hydration of H2CO3 takes place and it is only donating the protons, not electrons.

Is HCl + H2CO3 a precipitation reaction

The reaction of HCl + H2CO3 is not a precipitation reaction because there is only the formation of gasses of chlorine and carbon monoxide is taking place which cannot settle down in the water.

Is HCl + H2CO3 reversible or irreversible reaction

HCl + H2CO3 is an irreversible reaction because the formation of gasses happens as a product and water only remains as a bi-product which cannot be reversed in the form of another chemical compound.

Is HCl + H2CO3 displacement reaction

 HCl + H2CO3 is not a displacement reaction because of the exchange of ions within the chemical species of opposite charge and Cl2 and CO are formed without displacement.


The H2CO3 (carbonic acid) is mostly found in food as it is the sign of fermentation of food products because it releases the gas carbon dioxide whereas, HCl is of two types dilute and concentric both are used for the chemical analysis of organic and inorganic compounds in the field of chemistry and analytical chemistry.

Read more facts on HCl:

HCl + ZnCO3
HCl + NaH
HCl + NaCl
HCl + MnSO4
HCl + SbOCl
HCl + SrCO3
HCl + Na2SO3
HCl + F2
HCl + Na2CO3
HCl + NaBr
HCl + Sr
HCl + Na2O
HCl + Sr(NO3)2
HCl +Li2O
HCl + CuS
HCl + Mn2(SO4)3
HCl + BaCO3
HCl + SO3
HCl + Mg2Si
HCl + Ag2CO3
HCl + NaClO2
HCl + H3PO4
HCl + Ag2O
HCl + Hg
HCl + Na2S2O3
HCl + Ca
HCl + Na2S
HCl +Li
HCl + Na2SiO3
HCl + Ag2S
HCl + MnS
HCl + Ag2C2
HCl + Pb(NO3)2
HCl +K2CO3
HCl + Sr(OH)2
HCl + FeSO3

Soumya Chourasiya

Hi....I am Soumya Chourasia, completed my Master's in Chemistry. I am working as a Subject Matter Expert in Chemistry. Before this, I used to teach chemistry for competitive examinations and school as well. Let's connect through LinkedIn here,https://www.linkedin.com/in/somya-chourasia-068378211