# Reactions of hydrochloric acid

Reaction with sodium hydroxide ($NaOH$) producing sodium chloride ($NaCl$) and water ($H_2O$) (neutralisation)

$HCl$ $+$ $NaOH$ $\longrightarrow$ $NaCl$ $+$ $H_2O$

Reaction with magnesium hydroxide ($Mg(OH)_2$) producing magnesium chloride ($MgCl_2$) and water ($H_2O$) (neutralisation)

$2HCl$ $+$ $Mg(OH)_2$ $\longrightarrow$ $MgCl_2$ $+$ $H_2O$

Reaction with magnesium ($Mg$) producing magnesium chloride ($MgCl_2$) and hydrogen gas ($H_2$)

$Mg$ $+$ $2HCl$ $\longrightarrow$ $MgCl_2$ $+$ $H_2$

Reaction with zinc ($Zn$) producing zinc chloride ($ZnCl_2$)) and hydrogen gas ($H_2$)

$Zn$ $+$ $2HCl$ $\longrightarrow$ $ZnCl_2$ $+$ $H_2$

Reaction with iron ($Fe$) producing iron(II) chloride($FeCl_2$) and hydrogen gas ($H_2$)

$Fe$ $+$ $2HCl$ $\longrightarrow$ $FeCl_2$ $+$ $H_2$

Copper

No reaction

Silver

No reaction

Gold

No reaction

Reaction with copper oxide(II) ($CuO$) producing copper(II) chloride ($CuCl_2$) and water ($H_2O$)

$2HCl$ $+$ $CuO$ $\longrightarrow$ $CuCl_2$ $+$ $H_2O$

Reaction with iron(III) oxide ($Fe_2O_3$) producing iron(III) chloride ($FeCl_3$) and water ($H_2O$)

$6HCl$ $+$ $Fe_2O_3$ $\longrightarrow$ $2FeCl_3$ $+$ $3H_2O$

Reaction with sodium carbonate ($Na_2CO_3$) producing sodium chloride ($NaCl$), water ($H_2O$) and carbon dioxide ($CO_2$)

$2HCl$ $+$ $Na_2CO_3$ $\longrightarrow$ $2NaCl$ $+$ $H_2O+CO_2$

Reaction with calcium carbonate ($CaCO_3$) producing calcium chloride ($CaCl_2$), water ($H_2O$) and carbon dioxide ($CO_2$)

$2HCl+CaCO_3 \longrightarrow CaCl_2+H_2O+CO_2$

Author: Émile Gérard