Answer:
Acids: [tex]HCl, C_5H_5NH^+[/tex]
Bases: [tex]C_5H_5N, Cl^-[/tex]
Explanation:
According to the Bronsted-Lowry acid-base theory, an acid is a proton donor and a base is a proton acceptor. In this case, notice that [tex]HCl[/tex] donates a proton, since after it loses a proton, it becomes a chloride anion. Therefore, [tex]HCl[/tex] is a Bronsted acid.
Similarly, [tex]C_5H_5N[/tex] is a proton acceptor and, therefore, a Bronsted base, since it becomes [tex]C_5H_5NH^+[/tex].
If we look at the reverse reaction, chloride can gain a proton to become [tex]HCl[/tex], meaning it's a conjugate base.
Finally, [tex]C_5H_5NH^+[/tex] is a conjugate acid, since it can donate a proton to chloride.
