15 Facts on HI + Ba(OH)2: What, How To Balance & FAQs

by

Hydroiodic acid is a strong acid and it can react with a strong base like barium hydroxide. Let us know some facts on the reaction between HI + Ba(OH)2.

HI is a colorless gas with an unpleasant smell. Barium hydroxide has the chemical formula Ba(OH)2. It is an odorless clear white powder. It is ionic in nature, with two hydroxide ions per molecule of barium hydroxide (Ba(OH)2) in an aqueous solution.

In this article, we will learn about the intermolecular forces, redox reaction, conjugate pairs, etc of the reaction between HI + Ba(OH)2.

What is the product of HI and Ba(OH)2?

BaI2 and water are the product formed when HI reacts with Ba(OH)2.

     HI + Ba(OH)2   =   BaI2 + H2O

What type of reaction is HI + Ba(OH)2?

The reaction between HI + Ba(OH)2 is an acid-base reaction, where HI being a strong acid neutralizes a strong base like Ba(OH)2 to produce BaI2 as salt and water.

How to balance HI + Ba(OH)2?

We have to follow the following steps to balance HI + Ba(OH)2:-

  • First, write down the general equation for the reaction.
  • Then we determine the state(s, l, g, aq) for each reactant and product.
  • Since HI is a strong acid so it dissociates completely into its constituents ion in an aqueous solution.
  • After that, we balance the number of moles of each element on either side of the equation.
  • The reaction is balanced and the balanced reaction is given as –

   2 HI (aq) + Ba(OH)2 (aq) = BaI2 (aq) + 2 H2O (aq)

HI + Ba(OH)2 titration

The titration for the reaction of HI + Ba(OH)2 is an acid-base titration. As HI is a strong acid and Ba(OH)2­ is a strong base. The titration can be conducted by following the procedure below-

Apparatus Used

Beakers, a wash bottle, a stirrer, a pipette, distilled water, a conical flask, a volumetric flask, and a pipette.

Indicator

In this titration, the main indicator used here is Phenolphthalein which is used to detect the end point of the titration.

Procedure

  • Hydroiodic acid, which is a strong acid in an aqueous solution is first taken in the conical flask and it is then titrated with the strong base Ba(OH)2.
  • 1 or 2 drops of phenolphthalein is then added to it.
  • It is then titrated with a known concentration of the strong base Ba(OH)2. After that solution of Ba(OH)2 is added to the solution of HI drop wisely until the solution turns pink and the endpoint is determined.
  • After that, we note down the number of volume required to neutralize the hydroiodic acid solution.
  • The above steps is repeated for three times until three consistent readings are made.

HI + Ba (OH)2 net ionic equation

The net ionic equation between HI + Ba (OH)2 is –

2 H+ + 2 I– + Ba 2+ + 2 OH– = Ba 2+ + 2 I– + 2 H2O

To write the net ionic equation the following steps must be followed:-

  • Write the balanced equation for the reaction.
  • Then write down the physical state of each reactant and product.
  • 2 HI (aq) + Ba (OH)2(aq) = BaI2 (aq) + 2 H2O (l)
  • HI is a strong electrolyte so it will dissociate completely to form 2 H+ and 2 I+ ions.
  • 2 HI (aq) =  2 H+ + 2 I–
  • In Ba (OH)2, barium has a formal charge of+2 and hydroxide has a formal charge of -1 so it dissociates into Ba2+ and 2 OH–.
  • Ba (OH)2 (aq)  =  Ba2+ + 2 OH–
  • On the product side of the balanced equation, BaI2 dissociates into Ba2+ and 2 I–.
  • Thus the net ionic reaction is obtained.

HI + Ba (OH)2 conjugate pairs

HI + Ba(OH)2 reaction has the following conjugate pairs-

  • The conjugate base of HI is I– ion.
  • The conjugate acid of Ba(OH)2 is Ba2+.

HI + Ba (OH)2 intermolecular forces

HI + Ba(OH)2 reaction has the following intermolecular forces-

HI + Ba (OH)2 reaction enthalpy

HI + Ba (OH)2 has negative standard reaction enthalpy.

Is HI + Ba (OH)2  a buffer solution?

HI + Ba (OH)2 is not a buffer solution because both are strong acids and strong bases respectively. For a solution to be considered a buffer solution it must consist of a weak acid with its salt or a weak base with its salt.

Is HI + Ba (OH)2  a complete reaction?

HI + Ba (OH)2 is a complete solution as both HI and Ba (OH)2 is strong acid and base respectively so it dissociates completely into its constituent cation and anion.

Is HI + Ba (OH)2   an exothermic reaction?

HI + Ba (OH)2 is an exothermic reaction as the reaction enthalpy is negative.

Is HI + Ba (OH)2   a redox reaction?

HI + Ba (OH)2 is not a redox reaction as there is no change in the oxidation state.

Is HI + Ba (OH)2   a precipitation reaction?

HI + Ba (OH)2 is not a precipitation reaction as the salt formed is completely soluble in the solution.

Is HI + Ba (OH)2   an irreversible reaction?

HI + Ba (OH)2 is an irreversible reaction as we can not reverse the direction of the reaction, i.e. we can not get reactants from products.

Is HI + Ba (OH)2   a displacement reaction?

HI + Ba (OH)2 is not a displacement reaction as it does not take the form of AB + CD = AD + CB.

The product formed in the reaction which is BaI2 is widely used for the manufacturing of iodine. It is colorless and completely soluble in water. It is utilized to densify the copper castings that were the subject of a study presented to the Electrochemical Society.