Q. Water is well known amphoprotic solvent. In which chemical reaction water is behaving as a base?

A) $H_{2}SO_{4} + H_{2}O \rightarrow H_{3}O^{+} + HSO_{4}^{-}$
B) $H_{2}O + H_{2}O \rightarrow H_{3}O^{+} + OH^{-}$
C) $H_{2}O + NH_{2}^{-} \rightarrow NH_{3} + OH^{-}$
D) $H_{2}O + NH_{3} \rightarrow NH_{4}^{+} + OH^{-}$
Explanation

(a)
According to Bronsted-Lowry concept, bases are the substance which have a tendency to accept a proton.
(A)$H_{2}SO_{4} + H_{2}O\ \ \ \rightarrow H_{3}O^{+}\ \ \ \ \ \ \ \ \ \ \ \ + \ \ \ \ \ HSO_{4}^{-}$
acid base conjugate conjugate
acid base
(A)$H_{2}O\ \ \ \ + H_{2}O\ \ \ \ \rightarrow H_{3}O^{+}\ \ \ \ \ \ \ \ \ \ \ + \ \ \ \ \ \ \ OH^{-}$
acid base conjugate conjugate
acid base
(A)$H_{2}O\ \ + \ \ NH_{2}^{-}\ \ \ \rightarrow NH_{3}\ \ \ \ \ \ \ \ \ \ \ \ \ + \ \ \ \ \ \ \ OH^{-}$
acid base conjugate conjugate
acid base
(A)$H_{2}O\ \ \ + \ NH_{3}\ \ \ \rightarrow NH_{4}^{+}\ \ \ \ \ \ \ \ \ \ \ \ + \ \ \ \ \ \ \ OH^{-}$
acid base conjugate conjugate
acid base

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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