$pH=1\Rightarrow \left[ {{H}^{+}} \right]=0/1\Rightarrow M=0/1\Rightarrow molHCl=0/1\times 0/1=0/01mol$ $HCl(aq)+NaHC{{O}_{3}}(s)\Rightarrow NaCl(aq)+{{H}_{2}}O(l)+C{{O}_{2}}(g)$ $\frac{0/01}{1}=\frac{x}{22/4}\Rightarrow x=0/224LC{{O}_{2}}$