15 Facts on HI + AgOH: What, How To Balance & FAQs

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HI + AgOH is an important inorganic reaction. Let us inspect various aspects of it in this article.

Hydrogen iodide is a strong acid that can easily ionize in an aqueous medium and act as an analytical reagent. Silver hydroxide on the flip side is a base and unstable species that exist in low concentration.

HI + AgOH reaction leads to the formation of silver iodide and water molecules where silver iodide settles in the water. Let us understand various other properties related to it like the product, reaction type, forces, etc.

What is the product of HI and AgOH?

HI + AgOH reaction produces AgI and H2O. Here AgI or silver iodide is the main product and H2O is the by-product of the reaction. HI + AgOH is very similar to the neutralization reaction.

HI + AgOH = AgI + H2O

What type of reaction is HI + AgOH?

HI + AgOH is an acid-base reaction and double displacement reaction. This is because the reactants HI and AgOH are acid and base respectively and undergo an exchange of cations and anions.

How to balance HI + AgOH?

HI + AgOH reaction can be balanced by the following steps:

  • Write the equation mentioning its reactants and products.
  • Count the number of atoms on both the reactant and product side
  • Balance the atoms on both sides using a hit-and-trial method.
  • Check the stoichiometry and rewrite the equation.

HI + AgOH = AgI + H2O

Name of the elementNo. of atoms (Reactants)No. of atoms (Products)
Hydrogen (H)22
Oxygen (O)11
Silver (Ag)11
Iodine (I)11
Table representing no. of atoms in HI + AgOH

HI + AgOH titration

HI + AgOH undergoes acid-base titration.

Apparatus used

Burette, Pipette, Conical flask, beaker, glass rod, measuring jar, Burette stand.

The indicator used

In strong acid vs weak base reaction methyl orange is the preferred indicator where the color indication will be from red to orange and then the endpoint will be yellow.

Process

Titration in the case of HI + AgOH which is a strong acid vs weak base leads to acidic domination. The conjugate acid formed reacts with water forming H3O+ or hydronium ion which reduces the pH level, and the endpoint is not neutral but is a little acidic.

HI + AgOH net ionic equation

HI + AgOH net ionic equation can be represented and determined by the following steps:

H+ + OH– = H2O

  • Write the complete balanced equation along with their solubility quotient.
  • Split the reactants and products into their respective ions and cancel the similar ions.
  • The ones left will be the net ionic equation. Also, mention the spectator ions and the precipitates formed.
  • HI(aq) + AgOH(aq) = AgI(s) + H2O(l)
  • H+ + I– + Ag+ + OH– = Ag+ + I– + H2O
  • H+ + OH– = H2O
  • The net ionic equation as mentioned above is the formation of water molecule by association of hydrogen ion and hydroxy ion.
  • The spectator ion in HI + AgOH reaction are Ag+ and I–.

HI + AgOH conjugate pairs

The conjugate pairs of HI + AgOH are:

  • In HI + AgOH, HI is an acid and its conjugate base is I–.
  • In HI + AgOH reaction, OH– is a base whose conjugate acid is H2O.

HI and AgOH intermolecular forces

HI + AgOH shows the following intermolecular forces in the individual reactants:

  • The intermolecular forces exhibited by HI are London forces and dipole-dipole forces. It is expected that it will show hydrogen bonds but due to the large size of iodine and low electronegativity, it is not formed.
  • AgOH exhibits ion-dipole forces but unlike its other counterparts, it has a very strong force and does not easily dissociate in the aqueous medium and prefers to precipitate out of solution.

HI + AgOH reaction enthalpy

The standard enthalpy of formation in HI + AgOH is -62.4 KJ/mol. It can be calculated by subtracting the enthalpy of the reactants from the enthalpy of the products. Also, the enthalpy is negative which implies heat production and exothermic nature.

Is HI + AgOH a buffer solution?

HI + AgOH cannot form a buffer solution because HI is a strong acid that undergoes complete dissociation. Also, the product formed undergoes precipitation which further limits the possibility of buffer solution formation.

Is HI + AgOH a complete reaction?

HI + AgOH is a complete reaction because the equilibrium in the reaction is not dynamic. Instead, it is completely in the forward reaction with no residues left. Hence the concentration of reactants is completely exhausted after the product formation.

Is HI + AgOH an exothermic or endothermic reaction?

HI + AgOH is an exothermic reaction because it is a neutralization reaction where the reaction mixture turns warm after the product formation. Apart from that its product AgI precipitates which implies low entropy which leads to negative Gibbs energy.

Is HI + AgOH a redox reaction?

HI + AgOH is not a redox reaction because its product AgI precipitates out which implies the transference of only hydrogen ions without the change in the oxidation number.

Is HI + AgOH a precipitation reaction?

HI + AgOH is a precipitation reaction because the product AgI formed does not dissolve in water and settles at the bottom. It precipitates out in a solid yellow form.

Is HI + AgOH reversible or irreversible reaction?

HI + AgOH is an irreversible reaction like any other acid-base reaction because the equilibrium dynamics is in a forward reaction. So in product formation, the reactants are ultimately exhausted thereby confirming their irreversible nature.

Is HI + AgOH displacement reaction?

HI + AgOH is a double displacement reaction where there is an exchange of both cations and anions. In HI + AgOH reaction the product formation reveals that H+ and OH– form water and Ag+ and I– result in AgI.

Conclusion

In nutshell, HI + AgOH is a double displacement, precipitation, and acid-base reaction which can undergo titration and is a good example of a weak base and strong acid reaction.