HBr is an inorganic acid, whereas Li2SO3 is an alkali metal sulphate. Let us discuss a brief detail on HBr + Li2SO3 reaction below.
Li2SO3 is a white powdered solid basic salt. Li2SO3 is used in Li-battery as electrolyte solutions. HBr is a colorless, powerful mineral acid. HBr is formed by the reaction of hydrogen gas and bromine. HBr is used as a laboratory reagent.
In this article we will studies the various facts and properties of the reaction of HBr and Li2SO3.
What is the product of HBr and Li2SO3?
Lithium bromide (LiBr), sulphur dioxide (SO2), and water (H2O) are formed from the reaction of HBr+Li2SO3, where unstable sulfurous acid (H2SO3) easily breaks down into water and sulphur dioxide.
2HBr + Li2SO3 → 2LiBr +H2SO3 → H2O + SO2
What type of reaction is HBr + Li2SO3?
HBr and Li2SO3 is a double displacement reaction.
How to balance HBr + Li2SO3?
The imbalanced equation for the HBr + Li2SO3 is-
HBr + Li2SO3 → LiBr + SO2 + H2O
The reaction is balanced using the following steps:
- Count the number of atoms or ions for both sides of reaction.
Reactant side | Product side |
H = 1 | H =2 |
Br = 1 | Br =1 |
Li =2 | Li = 1 |
S = 1 | S =1 |
O =3 | O = 3 |
- To match the H and Li atom numbers, HBr will be multiplied by the number 2 and LiBr is also multiplied by 2.
- Thus, the balanced equation is:
- 2HBr + Li2SO3 → 2LiBr + SO2 + H2O
HBr + Li2SO3 titration
Back titration is required to calculate the concentration of the insoluble salt Li2SO3 in HBr.
Apparatus
Pipette, burette, conical flask, volumetric flask, distilled water, burette holder, beakers and wash bottle and stirrer.
Indicator
Phenolphthalein is used as an indicator for acid-base titration to identify the end point of titration.
Procedure
- Pipette out HBr (determined volume and concentration) in a conical flask containing a solution of Li2SO3.
- Add a few drops of phenolphthalein indicator after thoroughly mixing the mixture of the flask.
- Now, titrate the acid that is extra HBr by adding known concentrations of sodium hydroxide (NaOH) solution from a burette till a very faint permanent pink colour is obtained.
- To check the precision and record the readings of burette analysis, repeat the procedure at least 2 to 3 times.
- At last the quantity of unreacted HBr is calculated by using the equation S1V1 = S2V2.
- By knowing the quantity of unreacted HBr, the amount of Li2SO3 is calculated that interacted with HBr.
HBr + Li2SO3 net ionic equation
The net ionic equation for HBr + Li2SO3 is –
SO32− (aq) + 2H+ (aq) → H2O (l) + SO2 (g)
To derive the net ionic equation, following steps are used:
- Ionic compounds dissociate into ions as positive ion (cation) and negative ion (anion).
- Ionic substances like HBr, Li2SO3, and LiBr is represented as cations and anions.
- 2H+ (aq) + 2Br− (aq) + Li2+ (aq) + SO32− (aq) → 2Li+ (aq) + 2Br− (aq) + H2O (l) + SO2 (g)
- At last, by cancelling the spectator ions through both ends, we obtain the net ionic equation as:
- SO32− (aq) + 2H+ (aq) → H2O (l) + SO2 (g)
HBr + Li2SO3 conjugate pairs
HBr and Li2SO3 conjugate pairs are
2HBr + Li2SO3 → 2LiBr + SO2 + H2O
- HBr is a strong acid with conjugate base Br–.
- The conjugate pair for Li2SO3 is impossible as it is a metal sulphite.
HBr and Li2SO3 intermolecular forces
HBr+ Li2SO3 has the following intermolecular forces,
- Dipole-dipole interaction is present in HBr. As HBr is a polar molecule, thus due to polar nature of HBr, dipole-dipole interaction and London dispersion force (Van der Waals forces).
- Electrostatic force of attraction is present in Li2SO3 as it is ionic in nature. In Li2SO3, Li2+and SO3- ions are present so, electrostatic force of attraction is present.
HBr + Li2SO3 reaction enthalpy
The enthalpy of a reaction is -391.24 kJ/mol and is calculated by finding the difference between the heat of formation of both product and reactant. For the reaction of HBr and Li2SO3 the enthalpy of formation has been listed below-
- HBr = 36.23 kJ/mol
- Li2SO3 = -1177.0 kJ/mol
- LiBr = -351.2 kJ/mol
- H2O = 286.0 kJ/mol
- SO2 = –296.9 kJ/mol
- Thus, Enthalpy of reaction = (2×36.23 – 1177.0) – (-351.2 × 2 + 286.0- 296.9 )
- = -391.24 kJ/mol
Is HBr + Li2SO3 a buffer solution?
HBr and Li2SO3 is not a buffer solution as HBr being a strong acid dissociate completely in solution.
Is HBr + Li2SO3 a complete reaction?
HBr + Li2SO3 is a complete reaction because both the reactants completely react with each other and produce stable products as lithium bromide (LiBr), Water (H2O) and sulphur dioxide(SO2).
Is HBr + Li2SO3 an exothermic or endothermic reaction?
HBr + Li2SO3 is exothermic in nature as LiBr is formed which is an ionic compound and thus heat is released during the reaction.
Is HBr + Li2SO3 a redox reaction?
HBr + Li2SO3 is not a redox reaction as there is no change in the oxidation numbers of reactant and products.
Is HBr + Li2SO3 a precipitation reaction?
HBr + Li2SO3 is not a precipitation reaction as the product LiBr is water soluble compound and the other products are water and SO2 gas.
Is HBr + Li2SO3 reversible or irreversible reaction?
HBr +Li2SO3 is irreversible as this reaction moves only in one direction.
Is HBr + Li2SO3 displacement reaction?
HBr + Li2SO3 is a double displacement reaction because in this reaction both Br– and SO32- ions are interchanged between two reactant molecules, HBr and Li2SO3.
Conclusion
The reaction of HBr produces LiBr, which is a white solid and H2SO3. LiBr forms crystalline hydrates and it is used as a coolant in industrial air cooling systems and also used as a desiccant. H2SO3 which is a colourless reducing agent and it is unstable in an aqueous solution.
Hello…I’m Rupali Bhadauria, a Chemistry Subject Matter Expert with a passion for creating educational and engaging articles on a wide range of topics related to chemistry. With a master’s degree in Chemistry, I have written for a variety of publications, including magazines. My writing is concise and well-researched, and I strive to make complex topics easily understandable for readers. “I’m interested in everything related to Chemistry and its aligned fields!”