\(\left(1\right)MgCl_2+2KOH\rightarrow Mg\left(OH\right)_2+2KCl\\ \left(2\right)Cu\left(OH\right)_2+2HCl\rightarrow CuCl_2+2H_2O\\ \left(3\right)Cu\left(OH\right)_2+H_2SO_4\rightarrow CuSO_4+2H_2O\\ \left(4\right)FeO+2HCl\rightarrow FeCl_2+H_2O\\ \left(5\right)Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
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