c$.$ HSOr can behave either as an acid or a base.

$($i$)$ Give the term used for substances such as HSO;.

$($ii$)$ Write down the balanced equation for the reaction of $HS{O}_4$ with $H_{2}O$ in which $HS{O}_4$ acts as an acid.

$(3)$

d$.$ Ammonia reacts with water to produce ammonium ions and hydroxide. Identify the conjugate acid$-$base pairs.

$N{H}_3(aq)+H_{2}O(l)N{H}_4^{+}(aq)+O{H}^{-}(aq)$

e$.$ A $340c{m}^3$ of a $1\mathrm{.}5mo{l}^{d}d{m}^{-3}$ potassium hydroxide solution reacts with $150c{m}^3$ solution of hydrochloric acid. Calculate the concentration of acid needed to react with a base.

f$.$ Calculate the $pH$ of a $0\mathrm{.}35mo{l}^{-dm}{m}^{-3}HCl$ solution.

$(3)$

g$.$ Calculate the $pH$ of a $0\mathrm{.}29$

mol.dm ${?}^{-3}$NaOH solution.

$(4)$

$(5)$

$[25]$