Ammonium bromide (NH4Br) is a salt. Sulphuric acid (H2SO4) is used as a catalyst in some reactions. Let us discuss some reactions and other properties of H2SO4 + NH4Br.
Ammonium bromide is a crystalline compound which is present in white color crystals. It is a weak acidic in nature and is soluble in the water and other organic compounds. Sulphuric acid is an inorganic strong acid and the nature of this acid is mineral. It is corrosive in nature, non-flammable, oxidizing agent.
In detail,we are going to learn some key aspects of H2SO4 + NH4Br reactions, products, net ionic reactions, intermolecular forces, and buffer solutions.
What is the product of H2SO4 and NH4Br
H2SO4 + NH4Br form ammonium hydrogen sulfate(NH4HSO4) and hydrogen bromide(HBr) and also form ammonium sulfate (NH4)2SO4 and hydrogen bromide.
2NH4Br + H2SO4 → (NH4)2SO4 + 2HBr
NH4Br + H2SO4 → NH4HSO4 + HBr
What type of reaction is H2SO4 + NH4Br
H2SO4 + NH4Br is a double displacement reaction and acid-base reaction.
How to balance H2SO4 + NH4Br
The unbalanced equation for H2SO4 + NH4Br is written below-
NH4Br + H2SO4 → (NH4)2SO4 + HBr
For balancing this reaction, we should follow these steps which is mentioned below-
- In this reaction S, O, Br atoms are equal on both the reactant and the product side of the equation.
- The number of NH4 compounds on both sides are not equal. For balancing this we should multiply it by 2 on the reactant side.
- 2NH4Br + H2SO4 → (NH4)2SO4 + HBr
- After balancing this number of Br atoms is increased on the reactant side.
- Now we will multiply HBr by 2, so the number of H atoms and Br atoms will become equal on both sides.
- Thus, the final balanced reaction for H2SO4 + NH4Br is-
- 2 NH4Br + H2SO4 → (NH4)2SO4 +2 HBr
H2SO4 + NH4Br Titration
To estimate the salt NH4Br by H2SO4, titration is carried out.
Apparatus
- Pipette
- Burette
- Beaker
- Volumetric flask
- Conical Flask
Indicator
The phenolphthalein is using as an indicator in acid-base titration.
Procedure
- In the first step weigh the sample of ammonium bromide and dissolve in normal water and mix it well in a conical flask.
- Now add this sample preparation into the burette.
- The titrant H2SO4 is taken into the pipette and poured into the conical flask.
- Add that unknown sample of (NH4Br) into the conical flask drop wise.
- When a reaction occur in a flask than add the indicator.
- The indicator phenolphthalein is added and color of the reaction becomes pink and then it will disappear at the end point.
- The above process is repeated three times for accurate readings.
- The concentration of the solution is calculated by m1v1=m2v2.
H2SO4+NH4Br net ionic equation
The net ionic equation for H2SO4+NH4Br is not possible as all the ions present in this reaction are spectator ions and because of this, is not able to give net ionic equation.
H2SO4 + NH4Br conjugate pairs
In this reaction of H2SO4 + NH4Br the available conjugated pairs are as follows.
- The conjugate acid of H2SO4 = HSO4–
- The conjugate acid of NH4+ = NH3
- The conjugate acid of HSO4–= SO4-2
H2SO4 and NH4Br intermolecular forces
The H2SO4+NH4Br has the following intermolecular forces-
- The H2SO4 compound has dipole-dipole interaction, hydrogen bonding, and vanderwall dispersion. The hydrogen bonding is the strongest bonding for H2SO4.
- The NH4Br contains ionic forces because the compound has ammonia and bromide ions.
H2SO4 + NH4Br reaction enthalpy
The reaction enthalpy of H2SO4+NH4Br is -101.9 KJ/mol. It is calculated by using the values given in the table below.
Compound | Enthalpy of formation in KJ/mol |
---|---|
NH4Br(S) | -270,8 |
H2SO4 (aq) | -8114 |
(NH4)2SO4 (aq) | -1180.9 |
HBr(g) | -36.40 |
- ∆H=∆H(reactant)-∆H(product)
- ∆H=[2(-270.8)+(-814) – (-1180.9)+2(-36.4)] kJ/mol
- ∆H=-101.9 kJ/mol
Is H2SO4+NH4Br a buffer solution
In H2SO4+NH4Br reaction buffer solution is not possible because the H2SO4 acts as a strong acid and these types of compounds do not participate in the formation of buffer solutions.
Is H2SO4+NH4Br a complete reaction
H2SO4+NH4Br is a complete reaction because after the formation of (NH4)2SO4 and HBr gas, no further reaction is possible as these are complete products.
Is H2SO4+NH4Br an exothermic or endothermic reaction
H2SO4+NH4Br reaction is exothermic in nature, as the overall reaction enthalpy is negative 101.9kJ/mol, and according to thermodynamics first law heat is released from the reaction.
Is H2SO4+NH4Br a redox reaction
H2SO4+NH4Br is not a redox type reaction because the oxidation state of the reactant and the product side are similar and they do not change their oxidation state.
Is H2SO4+NH4Br a precipitation reaction
H2SO4+NH4Br is not a precipitation reaction because ammonium bromide is easily soluble in water.
Is H2SO4+NH4Br a reversible or irreversible reaction
H2SO4+NH4Br is an irreversible reaction because there are possibilities to the formation of other compounds.
Is H2SO4+NH4Br displacement reaction
H2SO4+NH4Br is a double displacement reaction in which cations and anions are formed because in the reaction NH4 ions are displaced by the H+ ions and the SO4 ions are displaced by the Br ions.
Conclusion
Ammonium bromide is easily dissolved in water, odorless and it is present in yellowish color crystals when it comes to the atmosphere. It is a salt of volatile acid and also able to give acid-base type reactions. This compound is used in pharmaceutical industries, wooden industries, textile, etc.
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