\(n_{HCl}=n_{H^+}=n_{Cl^-}=2.0,5=1\left(mol\right)\)
\(n_{K_2CO_3}=n_{CO_3^{2-}}=1.0,1=0,1\left(mol\right);n_{K^+}=0,2\left(mol\right)\)
\(H^++CO_3^{2-}\rightarrow CO_2+H_2O\)
\(0,1\leftarrow0,1\rightarrow0,1\)
\(\Rightarrow V_{CO_2}=0,1.22,4=2,24\left(l\right)\)
\(\Rightarrow\left[H^+\right]=\frac{1-0,1}{0,6}=1,5\left(mol/l\right)\)