15 Facts on HBr+Na2O: What, How to Balance & FAQs

Hydrobromide acid reacts with disodium oxide forms bromide salt of sodium. Let us study the reaction of HBr + Na2O in detail.

Sodium oxide is a white rarely encountered solid mainly used in glasses and ceramics. Hydrobromic acid is a strong colorless acid, usually used in the manufacturing of bromide compounds as a reagent. It is known as one of the strongest mineral acids.

The following article studies the various fact of HBr + Na2O reactions like the , product, enthalpy of the reaction, exothermic and endothermic behavior, conjugate pairs, reaction type, ionic equation, etc.

What is the product of HBr + Na2O?

Hydrobromic acid (HBr) reacts with sodium oxide (Na2O) to form sodium bromide (NaBr) and water (H2O)

Na2O + HBr → NaBr + H2O

What type of reaction is HBr + Na2O?

HBr + Na2O is a precipitate reaction, acid base, and exothermic reaction.

How to balance HBr + Na2O?

HBr + Na2O chemical reaction is balanced by following the below steps:

  • The unbalanced chemical reaction is written down as shown below:
  • Na2O + HBr → NaBr + H2O
  • Tabulate down the number of moles of each molecule present in the reactant and product side as shown below :
ElementsReactant SideProduct Side
Number of moles on the reactant and product side
  • The given HBr + Na2O chemical reaction is balanced when the number of moles of Na, Br, H and O, on the reactant side is equal to the number of moles of each element on the product side.
  • Here moles of Na, and H are unbalanced on either side.
  • To balance the given chemical reaction, multiply 2 each with NaBr on the product side and HBr on the reactant side and
  • The Balanced chemical reaction is
  • Na2O + 2HBr → 2NaBr + H2O
Capture 4
Balanced Chemical Reaction

HBr + Na2O Titration

HBr + Na2O is an acid base titration.


Pipette, Burette, Burette stand, Conical flask, Stirrer, Funnel, Measuring flask, White glazed tile, Watch glass..


Methyl orange


  1. The burette is washed, rinsed and cleaned thoroughly
  2. Fill the burette with M/10 Na2O solution and write down the initial reading.
  3. Transfer 10 cm3 of HBr solution into a cleaned and washed titration flask using a pipette.
  4. Add 2 to 3 drops of titrating indicator: Methyl orange
  5. Slowly drop by drop add the M/10 Na2O solution to the titration flask, till the color changes to light pink.
  6. Write down the final reading.
  7. Calculate the amount of sodium oxide solution used to neutralise the HBr solution
  8. (Na2O) a1M1V1 = (HBr) a2M2V2
  9. Strength (g/L) = M2 * 36.5         

HBr + Na2O Net ionic equation

The net ionic equation for HBr + Na2O is: Na2O(s) + 2H+(aq) = 2Na+(aq) + H2O(l).

  1. The state or phase (gas = g, liquid = l, solid/non-soluble = s, and aqueous/soluble = aq) of each substance is determined
  2. The complete ionic equation is written down by separating each ionic compounds into respective ion, as shown below:
  3. Na2O(s) + 2H+(aq) + 2Br(aq) = 2Na+(aq) + 2Br(aq) + H2O(l)
  4. The net ionic equation includes the ions which does not occur in both side of the reaction, the ions which occurs in both reactant and product side of the complete ionic equation are cancelled out as shown below
  5. Na2O(s) + 2H+(aq) + 2Br(aq) = 2Na+(aq) + 2Br(aq) + H2O(l)
  6. The net ionic equation is: Na2O(s) + 2H+(aq) = 2Na+(aq) + H2O(l)

HBr + Na2O conjugate pairs

The conjugate acid-base pairs for HBr + Na2O are

  • Conjugate acid of HBr =  HBr+
  • Conjugate base of HBr  = Br 
  • The conjugate pairs for Na2O cannot be written as it is a base which produces water, which is neutral.

HBr + Na2O intermolecular forces

The intermolecular forces on HBr and Na2O are-

HBr + Na2O reaction enthalpy

The change in reaction enthalpy for HBr + Na2O is: -1240.74 kJ/mol

To calculate the change in reaction enthalpy follow the below steps –

  • The enthalpy of formation of each compound on reactant and product side is tabulated down as:
CompoundsEnthalpy (kJ/mol)
Enthalpies of each compounds in the reaction
  • Change in reaction enthalpy = Sum of enthalpies on the product side – the sum of enthalpies on the reactant side.
  • Change in Enthalpy  =  (2*-722.12-241.8) – (-372.84-72.46)  = -1240.74 kJ/mol

Is HBr + Na2O a buffer solution?

HBr + Na2O reaction is not a buffer solution since strong HBr acid and strong Na2O base is involved during the reaction.

Is HBr + Na2O a complete reaction?

HBr + Na2O is a complete reaction as complete moles on the reactant side are consumed and converted into product at equilibrium, and no further reaction is possible.

Is HBr + Na2O an exothermic or endothermic reaction?

HBr + Na2O is an exothermic reaction because the change in reaction enthalpy is -1240.74 kJ/mol, which is negative, thereby decreases the temperature.

Is HBr + Na2O a redox reaction?

HBr + Na2O is not a redox reaction since the oxidation state of ions remains unchanged during the reaction.

Is HBr + Na2O a precipitation reaction?

HBr + Na2O is a precipitation reaction since the formation of NaBr takes place in the reaction which is a inorganic sodium salt.

Is HBr + Na2O irreversible or irreversible reaction?

HBr + Na2O is an irreversible reaction. It can only be reversed when there is a drastic change in pressure or temperature.

Is HBr + Na2O displacement reaction?

HBr + Na2O is double displacement reaction. Na and Br reacts to form NaBr and H and O reacts to form H2O.


The reaction of sodium oxide with Hydrobromic acid involves the formation of inorganic sodium salt along with water. This is an acid base, exothermic, precipitate reaction. Sodium bromide is mostly used as reagent in TEMPO-mediated oxidation reactions and is an important industrial chemical.