Calculate the quantities of ammonia $(25\%$ m$/$m$,$ d$=0\mathrm{.}907)$ and solid ammonium chloride p$.$a$.($MM: $53\mathrm{.}49$g$/$mol$)$ required to obtain, after dilution, $200$ ml of $0\mathrm{.}5$M buffer solution in acid form, pH $=9\mathrm{.}24.$

What will be the ionic strength of this buffer mixture?