For the reaction c5h5n(aq) + h2o(l) c5h5nh+(aq) + oh-(aq), which of the following is a conjugate acid-base pair?

a. c5h5n, c5h5nh+
b. c5h5nh+, oh-
c. h2o, oh-
d. c5h5n, h2o

b. ,

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:

Here, is accepting a proton, thus it is considered as a base and after accepting a proton, it forms which is a conjugate acid.

And, is losing a proton, thus it is considered as an acid and after loosing a proton, it forms which is a conjugate base.

Hence, the correct answer is b. ,

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