Hydrogen fluoride is a compound with the chemical formula HF. Hydrogen fluoride is also known as Fluorane. Let us focus on the reaction of HF + I2 in this article.
Hydrogen fluoride has a molar mass of 20.006gmol-1. An aqueous solution of HF is called hydrofluoric acid. HF melts at -83.60C whereas the boiling point is observed at 19.50C. I2 is diiodine with molecular weight 253.80 gmol-1. In I2, two iodine atoms joined together to form a diatomic molecule.
In this editorial, we will discuss various points related to HF + I2 reaction.
What is the Product of HF and I2
The Product of the HF + I2 reaction is F2 and HI. Difluorine has been released as a gas in HF + I2 reaction.
HF + I2 ⟶ HI + F2.
What type of reaction is HF + I2
The HF + I2 is an oxidation-reduction reaction where HF is a reducing agent and I2 is an oxidizing agent.
HF -1 + I20 ⟶ F20 +2HI-1.
How to balance HF + I2
For balancing a chemical reaction, there are various steps to follow.
- First, write down the chemical reaction.
- HF + I2 ⟶2HI + F2.
- The number of moles of elements on the reactant and product side which is tabulated below.
| Atom | Number of moles on reactant side | Number of moles on product side |
|---|---|---|
| H | 1 | 2 |
| F | 1 | 2 |
| I | 2 | 2 |
- In the above table, we can see that on the reactant side, one hydrogen atom, one fluorine atom and two iodine atoms are present, whereas, on the product side, two hydrogen atoms, two fluorine atoms and two iodine atoms are present, so we have to balance this.
- This can be balanced using the Algebraic method. Multiply HF on the reactant side, which will give a balance equation.
- After multiplying, the number of moles of elements on both sides will be
| Atom | Number of moles on reactant side | Number of mols on product side |
|---|---|---|
| H | 2 | 2 |
| F | 2 | 2 |
| I | 2 | 2 |
- Thus balanced equation will be
- 2HF +I2 ⟶ 2HI + F2 .
HF + I2 net ionic equation
The net ionic equation for the reaction HF + I2 is
2I– (aq) +2F (g) = 2F– (aq) + I2 (s)
- First, write down the complete balanced equation
- The reaction of HF + I2gives a balanced equation as follows
- 2HF +I2 ⟶ 2HI + F2 .
- The ionic equation can be written using the chemical equation below.
- 2H+ (aq) + 2I– (aq) + 2F (g) ⟶ 2H+ (aq) + 2F– (aq) +I2 (s).
- The net ionic equation count only the ion that takes part in the reaction.
- Spectator ions do not take part in the reaction. So ions on both sides of the reaction should be canceled.
- Finally net ionic equation written as 2I– (aq) +2F (g) = 2F– (aq) + I2 (s).
HF + I2 conjugate pairs
HF + I2 reaction has following conjugate acid-base pair ,
- Conjugate acid of HF ⟶ H2F+
- Conjugate base of HF ⟶ F–
HF and I2 intermolecular forces
HF + I2 reaction has following intermolecular forces ,
- The intermolecular forces which exist in HF molecules are Hydrogen bonds, dipole-dipole interaction and London dispersion force, as HF is a polar molecule, showing a covalent bond.
- In the I2 molecule, London dispersion forces exist. This is a temporary dipole that induces a dipole in neighboring molecules.
HF + I2 reaction enthalpy
The reaction enthalpy of HF + I2 reaction is 655.24 KJ mol-1.
- Enthalpy of formation of each compound on the reactant side as well as on the product side is calculated and written in table form.
| Compound | Enthalpy of Formation (KJ mol-1) |
|---|---|
| HF | -332.36 |
| I2 | 62.44 |
| F2 | 0 |
| HI | 26.48 |
- The enthalpy of the reaction is now calculated by subtracting the sum of the enthalpy of the reactant from the sum of the enthalpy of the Product.
- Enthalpy of reaction =( sum of the enthalpy of Product) – (Sum of the enthalpy of reactant)
= (26.48*2 + 0) – (-332.36*2) + 62.44 = +655.24 KJ mol-1
Is HF + I2 a buffer solution
HF + I2 is not a buffer solution since weak acid HF is present, but I2 is not its salt.
Is HF + I2 a complete reaction
HF + I2 is a complete reaction as the products formed during HF + I2 reaction will not give a further reaction.
Is HF + I2 an exothermic or endothermic reaction
HF + I2 reaction is an endothermic reaction as HF + I2 reaction gives the positive value of enthalpy of reaction, which is pointed at +655.24 KJ mol-1.
Is HF + I2 a redox reaction
HF + I2 is a redox reaction. Here HF is a reducing agent, and I2 is an oxidizing agent.
HF -1 + I20 ⟶ F20 +2HI-1.
Oxidation ⟶ 2F– -2e– ⟶ 2F0
Reduction ⟶ 2I0 +2e– ⟶ 2I–
Is HF + I2 a precipitation reaction
HF + I2 is not a precipitation reaction as no precipitate formed in HF + I2 reaction.
Is HF + I2 reversible or irreversible reaction
HF + I2 is an irreversible reaction as difluorine F2 formed on the product side is a gas. So there is no chance of giving a backward reaction by the Product.
Is HF + I2 displacement reaction
HF + I2 is a single displacement reaction as different Products are formed by changing partners on the reactant side.
Conclusion
Hydrogen fluoride is used to make stainless steel kitchen products. HF is used as an inhibitor for ceramics and fabrics. HF is also used as a rust remover. Iodine is used for purifying water. Hydroiodic acid is used as a reducing agent and manufacturing iodides. It is also used as primary source of iodine.
Hello everyone I am Arti D. Gokhale. My master’s with a specialization in Organic Chemistry and I graduated with Chemistry, Biology, and Zoology. I have 3 years of work experience in water analysis at the National Environmental Engineering Research Institute Nagpur.