, not how
. CC of Polish way of asking this question
The only Ca/OH-
complex I am aware of is CaOH+
. Calcium is not amphoteric, so Ca(OH)42-
doesn't exist. Or rather - even if it exist, stability constant is too low for the complex to be of any importance. Thing that can't be neglected when mixing Ca(OH)2
and NaOH is the common ion effect.