#### Challenge yourself
- At ambient temperature, the polyatomic ion OH−(aq) may not be considered truly amphiprotic as its basic properties dominate – losing H+ in solution is unlikely due to the instability of O2− in water. However, when a metal hydroxide such as magnesium hydroxide is heated, it decomposes as follows:
Mg(OH)2(s)→MgO(s)+H2O(g)
Derive the ionic form of this reaction to analyse how the hydroxide ion is showing amphiprotic behaviour here.