The reaction between hydroiodic acid and magnesium hydroxide is one of the methods for the preparation of magnesium iodide. The properties of reactants are discussed as follows
ሃይድሮጂን አዮዳይድ is a colorless gas with a pungent odor and its aqueous form is known as hydroiodic acid. ማግኒዥየም ሃይድሮክሳይድ is a partially water-soluble white solid, and it is commonly known as milk of magnesia. It has several applications in various fields like medicine (chewable tablets) and wastewater treatment.
Further details of the reaction between HI + Mg(OH)2 such as balanced chemical equation, net ionic equation, conjugate pairs, enthalpy, etc. are explained as follows
What is the product of HI and Mg(OH)2
The chemical reaction between HI and Mg(OH)2 የሚከተለው ነው-
2HI + Mg(OH)2 –> MgI2 + 2 ኤች2O
Hydroiodic acid and magnesium hydroxide react with each other and forms magnesium iodide (MgI2) እና ውሃ.
What is the product of HI and Mg(OH)2
The reaction between HI and Mg(OH)2 is a neutralization reaction to form magnesium salt and water.
How to balance HI + Mg(OH)2
HI + Mg(OH)2 –> MgI2 + ሸ2O
In the above chemical equation, the number of atoms of I, H, and O is not balanced. It can be balanced by multiplying the number of moles of HI by a coefficient of 2.
Thus, the balanced chemical equation would be,
2HI + Mg(OH)2 –> MgI2 + 2 ኤች2O
HI + Mg(OH)2መመራት
- Magnesium hydroxide can be volumetrically analyzed with a strong acid like HI.
- But, magnesium hydroxide is only partially soluble in water; so, the first step is to make magnesium hydroxide to be dissolved in water in an acidic medium by adding excess acid.
- Then, the amount of acid unreacted is to be calculated through titration.
Thus, this can be assayed through the back or residual titrimetric method.
ግብ
Assay of magnesium hydroxide with hydroiodic acid.
መሳሪያ ያስፈልጋል
Pipette, Burette, Conical flasks, beakers, etc.
ሥነ ሥርዓት
- In the first step, magnesium hydroxide is pipetted out to a conical flask and excess hydroiodic acid (IN) is added to dissolve Mg(OH)2 completely in the acidic medium.
- The unreacted acid can be calculated by titrating it against NaOH (1N) taken in the burette by adding methyl orange as an indicator.
- The color of the solution is pink in the acidic medium. At the endpoint, the color turns orange.
ሒሳብ
- Calculate the chemical factor of the reaction
- The volume of HI consumed by Mg(OH)2 = volume of HI added – Volume of NaOH reacted with unreacted HI
HI + Mg(OH)2 የተጣራ ionic ቀመር
2H+(aq)+ Mg(OH)2(s) –> Mg2+ (aq) + 2H2ኦ (ል)
HI + Mg(OH)2 ጥንድ conjugate
The conjugate pairs are:
- የHI = I ውህድ መሠረት-
- የ Mg (OH) conjugate አሲድ2 = ማግ2+
HI and Mg(OH)2 intermolecular ኃይሎች
The intermolecular forces between HI are strong dipole-dipole interaction and in Mg(OH)2 ionic bond is formed between Mg2+ እና ኦ.ኤች- ion።
HI + Mg(OH)2 ምላሽ enthalpy
Enthalpy of formation, ∆Hf° = ∆Hf°(products) – ∆Hf°(reactants)
= ∆Hf°(2H2O + MgI2) – ∆Hf°( HI + Mg(OH)2)
| የግቢ | ∆Hf° (KJ/mol) |
| HI | + 26.5 |
| ኤምጂ (ኦኤች)2 | -924.7 |
| H2O | -285.82 |
| ኤም.ጂ.አይ.2 | -364 |
∆Hf°(Products) = -935.64 kj/mol
∆Hf°(Reactants) = -871.7 KJ/mol
∆Hf°(Reaction) = ∆Hf°(Products) – ∆Hf°(Reactants)
= -935.64 – (-871.7)
= -63.94 ኪጄ / ሞል
Is HI + Mg(OH)2 የመጠባበቂያ መፍትሄ
It does not form a buffer solution.
Is HI + Mg(OH)2 የተሟላ ምላሽ
From the balanced chemical equation, it is clear that the reactants are converted into products, and not left unreacted; thus, this is a complete reaction.
Is HI + Mg(OH)2 አንድ exothermic ምላሽ
The heat evolved during the above reaction, hence it is exothermic.
Is HI + Mg(OH)2 የድጋሚ ምላሽ
Let us check out the oxidation state of reactants and products.
2HI + Mg(OH)2 H 2H2O + MgI2
2 ሸ+1I-1 + ሚግ2+(O-2H+1)2 –> 2H+12O-2 + ሚግ2+ I-1 2
Reactants side, H =4+
O = 4-
I = 2-
Mg = 2+
Product side, H = 4+
O = 4-
I = 2-
Mg = 2+
Here, the oxidation state of each element is the same on the reactant and the product side. Therefore, this is not a redox reaction.
Is HI + Mg(OH)2 የዝናብ ምላሽ
There is no precipitate formed as a product of this reaction. It forms a salt solution of magnesium iodide. Therefore, it is not a precipitation reaction.
Is HI + Mg(OH)2 ሊቀለበስ ወይም ሊቀለበስ የማይችል ምላሽ
Here, once the products (MgI2 + water) form, they cannot reproduce the initial reactance. Hence, the above reaction is an irreversible
Is HI + Mg(OH)2 የመፈናቀል ምላሽ
This reaction is an example of a double displacement reaction.
መደምደሚያ
The reaction between HI and Mg(OH)2 is a complete neutralization reaction and it produces a salt solution (magnesium iodide and water). This can be volumetrically analyzed by the back or residual titration method.
