DS$06$

$1..$: $2$ HCl $($aq$)+$ Na$2$CO$3($aq$)$ H$20(1)+$ CO$2($g$)+2$ NaCl $($aq$)$ MM of Na$2$CO$3=105\mathrm{.}99$ g $/$ mol, MM of HCI $=36\mathrm{.}46$ g$/$mol $$ titration $.$:$..$ HCl $=0\mathrm{.}500$ M Moles of HCl $=5\mathrm{.}05$ x $10-$mol $$ HCl $()=20\mathrm{.}8$ mL $.()[4$ marks$]1..-2$ HCl $($aq$)+$ Na$2$CO$3($aq$)$ H$20(1)+$ CO$2($g$)+2$ NaCl $($aq$)$ MM of Na$2$CO$3=105\mathrm{.}99$ g$/$mol$,$ MM of HCI $=36\mathrm{.}46$ g$/$mol $$ titration $.$:$.$ HCl $=0\mathrm{.}500$ M Moles of HCl $=5\mathrm{.}05$ x $10-3$ mol $$ HCl $()=20\mathrm{.}8$ mL $.()$