$$\begin{gathered} 2\mathrm{HCl} + \mathrm{Fe} \to {\mathrm{FeCl}}_2 + {\mathrm{H}}_2 \\ 2{\mathrm{H}}^{+} + 2{\mathrm{Cl}}^{—} + \mathrm{Fe} \to {\mathrm{Fe}}^{2+}+2{\mathrm{Cl}}^{—}+{\mathrm{H}}_2 \\ 2{\mathrm{H}}^{+} + \mathrm{Fe} \to {\mathrm{Fe}}^{2+}+{\mathrm{H}}_2 \end{gathered}$$

$$\begin{gathered} 2\mathrm{HCl} + \mathrm{NiO} \to {\mathrm{NiCl}}_2 + {\mathrm{H}}_2\mathrm{O} \\ 2{\mathrm{H}}^{+}+2{\mathrm{Cl}}^{—}+\mathrm{NiO} \to {\mathrm{Ni}}^{2+}+2{\mathrm{Cl}}^{—}+{\mathrm{H}}_2\mathrm{O} \\ 2{\mathrm{H}}^{+}+\mathrm{NiO} \to {\mathrm{Ni}}^{2+}+{\mathrm{H}}_2\mathrm{O} \end{gathered}$$

$$\begin{gathered} \mathrm{HCl} + {\mathrm{CH}}_3\mathrm{COONa} \to {\mathrm{CH}}_3\mathrm{COOH} + \mathrm{NaCl} \\ {\mathrm{H}}^{+}+{\mathrm{Cl}}^{—} + {\mathrm{CH}}_3{\mathrm{COO}}^{—}+{\mathrm{Na}}^{+} \to {\mathrm{CH}}_3\mathrm{COOH} + {\mathrm{Na}}^{+}+{\mathrm{Cl}}^{—} \\ {\mathrm{H}}^{+}+ {\mathrm{CH}}_3{\mathrm{COO}}^{—}\to {\mathrm{CH}}_3\mathrm{COOH} \end{gathered}$$

$$\begin{gathered} \mathrm{HCl} + {\mathrm{AgNO}}_3 \to {\mathrm{HNO}}_3 + \mathrm{AgCl} \\ {\mathrm{H}}^{+}+{\mathrm{Cl}}^{—} + {\mathrm{Ag}}^{+}+{{\mathrm{NO}}_3}^{—} \to {\mathrm{H}}^{+}+{\mathrm{NO}}_3{ }^{—}+ \mathrm{AgCl} \\ {\mathrm{Cl}}^{—} + {\mathrm{Ag}}^{+}\to \mathrm{AgCl} \end{gathered}$$

$\mathrm{HCl} + {\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_2\to {\left[{\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_3\right]}^{+}{\mathrm{Cl}}^{—}$

$14\mathrm{HCl} + {\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7 \to 2\mathrm{KCl} + 2{\mathrm{CrCl}}_3 + 3{\mathrm{Cl}}_2 + 7{\mathrm{H}}_2\mathrm{O}$

Соляная кислота не реагирует с сульфатом калия, платиной, водородом, бромидом кальция.