Question

Complete the following reaction \[RN{H_2} + {H_2}S{O_4} \to \]
A. \[{[RN{H_3}]^ + }HSO_4^ - \]
B. \[[RN{H_3}]_2^ + SO_4^{2 - }\]
C. \[RN{H_2}.{H_2}S{O_4}\]
D. No reaction

Answer 1

Hint: \[RN{H_2}\] is a general formula for an amine compound where R is the alkyl group. The nitrogen atom of the amine group contains a lone pair of electrons that it can donate to other atoms.

Complete Step by Step Solution:
In the given reaction, the two reactants are \[RN{H_2}\] and \[{H_2}S{O_4}\].\[RN{H_2}\] is the general representation of amine with R as an alkyl group whereas \[{H_2}S{O_4}\]is the chemical formula for sulphuric acid. Due to the presence of lone pair in the nitrogen atom, it acts as a base due to its ability to donate the lone pairs to other atoms and sulphuric acid is considered a strong acid as it completely dissociates to give its constituent hydrogen ion and sulphate ion on dissolving in water.

The reaction taking place between an acid and a base is known as a neutralisation reaction.
In a neutralisation reaction, an acid compound and a base compound react with each other to form salt as its main product by eliminating water molecules.

The complete reaction is shown below:
\[RN{H_2} + {H_2}S{O_4} \to [RN{H_3}]_2^ + SO_4^{2 - }\]
Therefore, the correct option is B.

Additional information:The pH of the salt is generally 7 but it can change depending upon the strength of an acid and base. If the acid is strong and the base is weak, the salt formed will have a pH of less than 7. If the base is strong and the acid is weak, then the salt form will have a pH of more than 7.

Note: It should be noted that the chemical formula of the salt is dependent on the alkyl group present in an amine. If the amine is \[C{H_3}C{H_2}N{H_2}\] than the salt formed will have the chemical formula \[[C{H_3}C{H_2}N{H_3}]_2^ + SO_4^{2 - }\] .