Oops,
what, 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.