Acetic acid is a weaker acid than sulphuric acid because

According to the $Br\text{\o}nsted$ theory,which are the acids in the following reaction?
$NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^-$

Identify the conjugate acid-base pair in the following reaction: $HCl_{(aq)} + H_2O_{(l)} \rightleftharpoons H_3O_{(aq)}^{+} + Cl_{(aq)}^{-}$

Explain the existence of hydronium ion in aqueous solution.

Acetic acid,$(CH_3COOH)$,has a $pK_a$ of $4.8$. Ethanol,$(CH_3CH_2OH)$,has a $pK_a$ of $16.0$. What are the major species present when acetic acid and ethanol are added to water and the $pH$ is adjusted to $7.0$?

In the reaction $HC_2O_4^{-} + PO_4^{3-} \rightarrow HPO_4^{2-} + C_2O_4^{2-}$,which are the two Brønsted bases?