HI and Li2S are known as Hydrogen iodide and Lithium sulfide respectively. HI is a strong acid and Li2S is a major component in electrical batteries. Let us know more about them.
HI is a strong acid which easily disassociates in water and diatomic molecule in nature. Hydrogen Iodide is a colorless gas and is subjected to Markovnikov and anti-Markovnikov rule similar to HCl and HBr. LiI has uses in various industries. H2S has rotten egg smell.
Here we will study the reaction between HI and Li2S, the product formed, conjugate pairs, buffer solution, type of reaction and much more in this article.
What is the product of HI and Li2S?
Lithium Iodide (LiI)and Hydrogen sulfide (H2S)are the products formed by reaction between HI and Li2S .
2HI + Li2S→2LiI+H2S
What type of reaction is HI and Li2S?
The reaction between HI and Li2S is a double displacement reaction.
How to balance HI and Li2S?
The reaction between HI and Li2S is as follows –
HI+ Li2S→ LiI+H2S
As it is not balanced on it own it can be balanced by following steps :-
- Calculate the number of moles of each element involved in both the reactant and product side of the reaction.
| Element | Reactant side | Product side |
|---|---|---|
| H | 1 | 2 |
| Li | 2 | 1 |
| S | 1 | 1 |
| I | 1 | 1 |
- It can be balanced by labelling each compound with variable.
- Solve for variable.
- Substitution and equating both side.
- Thus by simply multiplying hydrogen iodide by 2 on reactant side and Lithium sulfide on product side we get a balanced reaction.
- 2HI+ Li2S→ 2LiI+H2S
- As the number of each element in the reactant side and product is equal the reaction is balanced.
HI + Li2S titration
there are no significant evidence of titration between HI and Li2S as HI is a strong acid and Li2S is a weak electrolyte entities.
HI and Li2S net ionic equation
The net ionic equation between HI and Li2S is,
2HI(aq)+ Li2S(aq)→ 2LiI(aq)+H2S(s)
- To write the balanced molecular equation along with the physical state
- Then the ionic form of each of them existing in aqueous form and capable of forming dissociation is mentioned.
- The complete ionic equation is as given-
- 2H+(aq) + 2I–(aq) + 2Li+(aq) + S2–(aq) → 2Li+(aq) + 2I–(aq) + H2S(s)
- The balanced ionic reaction has only those species which are involved in the reaction. The ions found on both sides are removed and the net ionic equation is derived.
- 2H+(aq) + 2S–(aq) → 2H2S(s)
HI and Li2S conjugate pairs
The conjugate pairs of HI and Li2S are as follows:-
- HI has conjugate base I– or Iodide ion.
- Li2S has no conjugate acid as Li2S is a neutral inorganic compound.
HI and Li2S intermolecular forces
The intermolecular forces in HI and Li2S are as follows:-
- London Dispersion force and dipole-dipole forces are the Intermolecular force in HI.
- Li2S has ionic interactions as an intermolecular force in it. The ionic interactions are Li2+ and S2– in Li2S.
HI and Li2S reaction enthalpy
The reaction enthalpy of HI and Li2S is -210.01 kJ/ mol. The negative sign indicates that the energy is given out during the reaction.
| Compounds | Enthalpy (kJ/mol) |
|---|---|
| HI | 26.5 |
| Li2S | 298.15 |
| LiI | -270.48 |
| H2S | -20.6 |
Thus, 2(26.5)+298.15 – 2(-270.48)+(-20.6) gives -210.01 kJ/mol, which is the reaction enthalpy of HI and Li2S.
Is HI and Li2S a buffer solution?
HI and Li2S are not a buffer solutions because a buffer is a combination of weak acid and weak base. Here HI is a strong acid and Li2S is a weak electrolyte I.e. weak acid or base.
Is HI and Li2S a complete reaction?
The reaction between HI and Li2S is complete. The reactants are used completely to form the products hence it is complete in nature.
Is HI and Li2S an exothermic or endothermic reaction?
HI and Li2S is an exothermic reaction as a large amount of energy is released.
Is HI and Li2S a redox reaction?
HI and Li2S is not a redox reaction as neither oxidation nor reduction takes place simultaneously in this reaction. Also, the oxidation number remains unchanged, hence it is not redox in nature.
Is HI and Li2S a precipitation reaction?
The reaction between HI and Li2S is a precipitation reaction. The product H2S formed during the reaction is a precipitate that remains after the completion of reaction.
Is HI and Li2S reversible or irreversible reaction?
The reaction between HI and Li2S is irreversible reaction as it can’t take place in both way and the product formed cannot be retained.
Is HI and Li2S displacement reaction?
HI and Li2S is a double displacement reaction as displacement phenomena takes place twice during the reaction. The anionic interactions occurring during the reaction makes it double displacement reaction.
Conclusion
Hydroiodic acid is also used to make iodide.Li2S having molar mass 45.95g/mol and solubility in water and ethanol .Li2S is obtained by reacting Lithium with sulfur in presence of anhydrous ammonia. Lithium sulfide has main application in lithium-sulfur batteries.
Hello….I am Suman Rajpurohit. A post-graduate in Chemistry with a specialization in Organic Chemistry. Being a Science enthusiast I have passion for writing, and I create lucid and compact articles.
I aim to provide value that helps every person concerned with the field of Chemistry.
To know more, let’s connect over LinkedIn: