DK$01$

$1..$: $-2$ HCl $($aq$)+$ Na$2$CO$3($aq$)$ H$20(1)+$ CO$2($g$)+2$ NaCl $($aq$)$ MM of Na: CO; $=105\mathrm{.}99$ g$/$mol$,$ MM of HCI $=36\mathrm{.}46$ g$/$mol $.$:$.$ HCl $=0\mathrm{.}500$ M Moles of HCl $=5\mathrm{.}05$ x $10$ mol $$ HCl $()20\mathrm{.}7$ ml $.()$