VD20:
Cách 1: \(2NaCl_{\left(ddbh\right)}+2H_2O\xrightarrow[cmn]{đpdd}2NaOH+Cl_2\uparrow+H_2\uparrow\)
Cách 2: \(2NaCl_{rắn}+H_2SO_{4\left(đ\right)}\xrightarrow[]{t^o\ge400^oC}Na_2SO_4+2HCl\)
\(MnO_2+4HCl\rightarrow MnCl_2+Cl_2\uparrow+2H_2O\)
VD21:
\(16HCl_đ+2KMnO_4\xrightarrow[]{t^o}2KCl+2MnCl_2+5Cl_2\uparrow+8H_2O\\ 6HCl+KClO_3\xrightarrow[]{t^o}KCl+3Cl_2\uparrow+3H_2O\\ 8H_2SO_4+2KMnO_4+10NaCl\rightarrow5Cl_2\uparrow+K_2SO_4+2MnSO_4+8H_2O+5Na_2SO_4\)