In the reaction $NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^-$,water acts as a .......

Which solution contains the maximum number of $H^{+}$ ions?

Ammonium hydroxide is a weak base because

What is meant by the conjugate acid-base pair? Find the conjugate acid/base for the following species:
$HNO_{2}$,$CN^{-}$,$HClO_{4}$,$F^{-}$,$OH^{-}$,$CO_{3}^{2-}$,and $S^{2-}$

The species: $H_{2}O$,$HCO_{3}^{-}$,$HSO_{4}^{-}$,and $NH_{3}$ can act both as Bronsted acids and bases. For each case,give the corresponding conjugate acid and base.

Which of the following is a weak acid?