55. 2KOH+$H_2$$SO_4$→$K_2$$SO_4$+$2H_2O$

56. $Ba(OH)_2$+$H_2$$SO_4$→$BaSO_4↓$+$2H_2O$

57. $2Fe(OH)_3$+$3H_2$$SO_4$→$Fe_2(SO$$_4)$$_3$+$6H_2O$

58. 2NaOH+$H_3$$PO_4$→$Na_3$$PO_4$+$2H_2O$

59. $3Zn(OH)_2$+$2H_3$$PO_4$→$Zn_3(PO$$_4)↓$$_2$+$6H_2O$

60. $Al(OH)_3$+$H_3$$PO_4$→$AlPO_4↓$+$3H_2O$

61. 2NaOH+$CuSO_4$→$Cu(OH)_2↓$+$Na_2$$SO_4$

62. 3KOH+$AlCl_3$→$Al(OH)_3$+3KCl

63. $Ba(OH)_2$+$Na_2$$CO_3$→$BaCO_3↓$+2NaOH

64.  $Ca(OH)_2$+$ZnSO_4$→$CaSO_4↓$+$Zn(OH)_2↓$

Các phản ứng xảy ra:

\(2KOH + {H_2}S{O_4}\xrightarrow{{}}{K_2}S{O_4} + 2{H_2}O\)

\(Ba{(OH)_2} + {H_2}S{O_4}\xrightarrow{{}}BaS{O_4} + 2{H_2}O\)

\(2F{\text{e}}{(OH)_3} + 3{H_2}S{O_4}\xrightarrow{{}}F{{\text{e}}_2}{(S{O_4})_3} + 6{H_2}O\)

\(3NaOH + {H_3}P{O_4}\xrightarrow{{}}N{a_3}P{O_4} + 3{H_2}O\)

\(3Zn{(OH)_3} + 2{H_3}P{O_4}\xrightarrow{{}}Z{n_3}{(P{O_4})_2} + 6{H_2}O\)

\(Al{(OH)_3} + {H_3}P{O_4}\xrightarrow{{}}AlP{O_4} + 3{H_2}O\)

\(CuS{O_4} + 2NaOH\xrightarrow{{}}Cu{(OH)_2} + N{a_2}S{O_4}\)

\(3KOH + AlC{l_3}\xrightarrow{{}}Al{(OH)_3} + 3KCl\)

\(Ba{(OH)_2} + N{a_2}C{O_3}\xrightarrow{{}}BaC{{\text{O}}_3} + 2NaOH\)

\(Ca{(OH)_2} + ZnS{O_4}\xrightarrow{{}}Zn{(OH)_2} + CaS{O_4}\)