The $pK_a$ for acid $A$ is greater than $pK_a$ for acid $B$. The strong acid is

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 $S^{2-}$

When $HClO_4$ is dissolved in the weak acid $HF$,the following equilibrium is established:
$HF + HClO_4 \rightleftharpoons H_2F^+ + ClO_4^-$
Which of the following is the correct set of conjugate acid-base pairs?

Which of the following is not a Lewis base?

Select the reaction which will be favoured in the forward direction.

Derive the equation $K_a \times K_b = K_w$.