Question

Is$\mathrm{Mg}{\left(\mathrm{OH}\right)}_2$ Alkali?

Answer 1

Magnesium hydroxide($\mathrm{Mg}{\left(\mathrm{OH}\right)}_2$) is an alkali, but a very weak base that does not completely dissolve in water, despite the fact that the dissolved part is considered a strong base due to complete ion dissociation.

1. It is a strong base, as are the hydroxides of most alkali metals and alkaline earth metals.

Hence, it is an alkali.