Hydrogen bromide and Copper(ll)sulfide are inorganic compounds with chemical formulas HBr and CuS respectively. Let us know some facts based on the reaction between HBr and CuS.
Hydrogen bromide (HBr) is a colourless, suffocating gas soluble in water forming commonly used hydrobromic acid, whereas Copper (ll) sulfide (CuS) also known as covellite is formed by combing copper and bromine. It has multiple catalytic applications.
Here we are discussing specific reactions among HBr and CuS.
What is the product of HBr and CuS?
Aqueous Cupric Bromide [CuBr2] and gaseous dihydrogen Sulfide [H2S] are formed when solid HBr reacts with aqueous CuS.
HBr+CuS——> CuBr2+H2S
What type of reaction is HBr + CuS?
The reaction between HBr and CuS is a double displacement reaction as the two reacting compound HBr and CuS exchange their radicals to form two new compounds, specifically CuBr2 and H2S.
How to balance HBr + CuS?
HBr + CuS reaction is balanced using the traditional balancing method. The steps in balancing are given below:
- Initially, the raw form of the chemical equation is considered.
- HBr + CuS = CuBr2+H2S
- There is one hydrogen atom on the reactant side whereas the number of hydrogen atoms are two on the product side.
- So we multiply HBr on the product side by 2 to make the H atom number on both sides of the reaction the same.
- Thus equation gets transformed to 2HBr + CuS = CuBr2+H2S
HBr + CuS titration
The titration between HBr and CuS is practically impossible. The reason behind this is that the neutralization reaction is not taking place here and as a result determination of the endpoint through a pH change will not be possible.
HBr + CuS conjugate pairs
In the reaction between HBr and CuS, the following conjugate acid-base pair is formed.
- The conjugate base of HBr is Br–.
- HBr = H+ + Br–
- CuS does not form conjugate acid due to the absence of a proton.
HBr + CuS net ionic equation
The net ionic equation of HBr + CuS is
CuS(s) + 2H+(aq) = Cu2+(aq) + H2S(g)
In HBr + CuS reaction, HBr is in an aqueous state and is dissociated into H+ and Br–. The ionic equation of a reaction contains all the ions in dissociated form, but when we come to the net ionic equation spectator ions (here Br–) are not considered.
HBr and CuS intermolecular forces
HBr + CuS reaction consists of the following intermolecular forces,
- HBr contains a covalent interaction within the molecule.
- CuS contains dipole-ion interaction.
HBr + CuS reaction enthalpy
The enthalpy of the reaction between HBr + CuS is -42.58kJ/mol. The corresponding calculations are explained here.
- Enthalpy of formation of HBr= -35.66kJ/mol
- Enthalpy of formation of CuS= -48.5kJ/mol
- Enthalpy of formation of H2S= -20.6kJ/mol
- Enthalpy of formation of CuBr2 = -141.8kJ/mol
Hence, the enthalpy of the reaction is (-71.32-48.5) – (-2×35.66 + – 48.5) = -42.58 kJ/mol.
Is HBr + CuS a buffer solution?
HBr + CuS system is not a buffer solution. Because HBr is highly acidic and CuS dissolves in water to give CuSO4, a strong electrolyte.
Is HBr + CuS a complete reaction?
The reaction between HBr and CuS is complete. Two molecules of HBr react with one mole of CuS to give one mole of H2S and one mole of CuBr2.
Is HBr + CuS an exothermic reaction?
The reaction between HBr and CuS reaction is exothermic. Because, in HBr + CuS reaction, an amount of heat (-42.58 kJ/mol) is liberated.
Is HBr + CuS a redox reaction?
The reaction between HBr and CuS reaction is not a redox reaction, as the oxidation state of species is the same on the reactant and product side.
Is HBr + CuS a precipitation reaction?
HBr + CuS reaction is not a precipitation reaction as the CuS reactant is in a solid state.
Is HBr + CuS an irreversible reaction?
HBr + CuS reaction is an irreversible reaction as the energy change associated with the reaction is small.
Is HBr + CuS displacement reaction?
HBr + CuS reaction is a displacement reaction, specifically a double displacement reaction as two new compounds CuBr2 and H2S are formed due to the exchange of radicals by HBr and CuS.
CONCLUSION
In this article, the reaction between HBr and CuS has been discussed. As a result of the reaction, a greyish-black copper bromide (CuBr2) and Hydrogen sulfide (H2S), a colorless gas with a pungent smell are formed.
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