1. $2K+2H_{2}O\to H_2+2KOH$  

2. $2H_{2}O+Mg\to Mg{\left(OH\right)}_2+H_2$  

3. $2H_2+O_2\to 2H_{2}O$  

4. $H_{2}O+CaO\to Ca{\left(OH\right)}_2$

5. $Ca{\left(OH\right)}_2\stackrel{H_{2}O}{\leftrightarrow }C{a}^2++2O{H}^{-}$  

 

A $K$ potas

B $H_{2}O$ woda

C $H_2$  wodór

D $Mg{\left(OH\right)}_2$  wodorotlenek magnezu

E $Ca{\left(OH\right)}_2$  wodorotlenek wapnia

F $C{a}^{2+}$  kation wapnia

G  $O{H}^{-}$   anion wodorotlenkowy