Colour change is an important criterion to cause a reaction. Let us see if this reaction shows any such changes.
Sulphuric acid,colourless, mostly exists with water due to its hygroscopic nature. Methyl amine, the simplest of primary amines, has a peculiar pungent odour. It appears as a colourless gas with very low boiling point of -6.0ºC. The reaction is performed at ambient temperature and may form variety of products.
This article will see how the reaction of these acids and bases happen, with their properties and description.
What is the product of H2SO4 and CH3NH2?
H2SO4 and CH3NH2 are reacted to form an addition complex of methyl ammoniated sulphate complex. The reaction equation is:
- H2SO4 + 2CH3NH2 → [CH3NH3]+ HSO4– → (CH3NH2)2SO4
What type of reaction is H2SO4 + CH3NH2?
The reaction of H2SO4 and CH3NH2 is a dissociation reaction as products formed dissociate to ions in the solution.
How to balance H2SO4 + CH3NH2?
Following are the rules to equal the above reaction scheme:
- H2SO4 + CH3NH2 → (CH3NH2)2SO4
- Both the reaction and product side should be equal in atoms; keeping stoichiometry in check, multiply CH3NH2 with 2 to equal with the Methyl atoms of CH3NH2.
- The ionic equation form is already balanced.
- H2SO4 + 2CH3NH2 → [CH3NH3]+ HSO4–
H2SO4 + CH3NH2 Titration
The titration of H2SO4 and CH3NH2 will give noticeable results.
Apparatus
- Graduated burette
- Conical flask
- Volumetric flask
- Burette stands
- Sample beakers
Titre and Titrant
- CH3NH2 is used as the titrant, the substance to be analysed.
- H2SO4 is the titre, the concentration of which is known.
Indicator
Methyl Orange indicator is used for strong acid weak base titrations. It turns orange-red in an acidic environment while yellowish in a basic environment.
Procedure
- In the conical flask, a standardised known CH3NH2 solution is taken and kept diluted.
- Burette is then filled with H2SO4 and clamped to the stand.
- Few drops of methyl orange indicator(pH= 2.9-4.6) is added.
- Near endpoint, a very happening colour change is noticed, turning the solution reddish.
- The equivalence point shows equal moles of acid and base have reacted but solution is still acidic.
- The volume of base used is applied to estimate the strength of the acid by the formula:
- VCH3NH2 SCH3NH2 = VH2SO4 SH2SO4
H2SO4 + CH3NH2 Net Ionic Equation
H2SO4 and CH3NH2 reaction has the following net ionic equation,
- H2SO4 + 2CH3NH2 + H2O → [CH3NH3]+ HSO4– + H+ + OH–
H2SO4 + CH3NH2 Conjugate Pairs
H2SO4 + CH3NH2 reaction has the following conjugate pairs,
- Conjugate base of H2SO4= HSO4–
- Conjugate base of H2O= OH–
H2SO4 + CH3NH2 Intermolecular Forces
H2SO4 + CH3NH2 reaction has the following intermoleculr forces,
- H2SO4 shows an ionic character in an aqueous medium.
- CH3NH2 is nucleophilic, so, the lone pair of electrons is reactive and the Van der Waals forces are weak too.
- In a watery medium, a cluster acid-base system of CH3NH2.H2SO4(H2O) is formed, but thermodynamically less favourable.
H2SO4 + CH3NH2 Reaction Enthalpy
H2SO4 + CH3NH2 reaction has no reaction enthalpy but it is believed the enthalpy is negative. The enthalpy information is as follows:
- Enthalpy of Formation of CH3NH2 = -47.1 kJ/mol
- Enthalpy of Formation of H2SO4 = -814 kJ/mol
Is H2SO4 + CH3NH2 a Buffer Solution?
H2SO4 + CH3NH2 reaction cannot give a strong buffer solution because it has a strong acid like sulphuric acid cannot be a part of the buffer.
Is H2SO4 + CH3NH2 a Complete Reaction?
H2SO4 + CH3NH2 reaction can be called complete as,once equilibrium is reached, products are completely formed.
Is H2SO4 + CH3NH2 an Exothermic Reaction?
H2SO4 + CH3NH2 reaction is exothermic with a negative enthalpy of reaction.
Is H2SO4 + CH3NH2 a Redox Reaction?
H2SO4 + CH3NH2 reaction is not an actual redox reaction as no changes in oxidation states of both ions are observed at the product side .
Is H2SO4 + CH3NH2 a Precipitation Reaction?
H2SO4 + CH3NH2 reaction is not a precipitation reaction because no precipitate is observed. Instead, there are possibilities of complexation or addition complex.
Is H2SO4 + CH3NH2 a Reversible Reaction?
H2SO4 + CH3NH2 reaction is reversible in nature like most acid-base reactions, should we slightly change the conditions of the reaction medium.
Is H2SO4 + CH3NH2 a Displacement Reaction?
H2SO4 + CH3NH2 reaction is not a double displacement reaction as the ions have not been replaced or interchanged in the product side.
Conclusion
H2SO4, a good oxidising agent, has a pH of 1.87 in a 10mM solution and shows high exothermicity in presence of water. Methyl amine is soluble in water, with a tendency to form H-bonds. In titration, the principle of reversibility applies when all moles of the base get reacted with the acid.
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