Answered

For the reaction C5H5N(aq) + H2O(l) C5H5NH+(aq) + OH-(aq), which of the following is a conjugate acid-base pair?

AC5H5N, C5H5NH+
BC5H5NH+, OH-
CH2O, OH-
DC5H5N, H2O

Verified Answer :

Greenleafable

A conjugate acid results when a chemical species receives a hydrogen ion. Moreover, the conjugate base is what is formed after the conjugate acid has been formed. In this case, C5H5N accepts a hydrogen ion, becoming a conjugate acid and the species left over is OH-, making it the conjugate base. Therefore, the answer is B.

Answer: b. \(C_5H_5NH^+\), \(OH^-\)

Explanation:

According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.

For the given chemical equation:

\(C_5H_5N(aq.)+H_2O(l)\rightarrow C_5H_5NH^+(aq.)+OH^-(aq.)\)

Here, \(C_5H_5N\) is accepting a proton, thus it is considered as a base and after accepting a proton, it forms \(C_5H_5NH^+\) which is a conjugate acid.

And, \(H_2O\) is losing a proton, thus it is considered as an acid and after loosing a proton, it forms \(OH^-\) which is a conjugate base.

Hence, the correct answer is b. \(C_5H_5NH^+\), \(OH^-\)

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