How this reaction (during qualitative analysis) is possible: Zn^(2+) + NaOH ------> Zn(OH)2 + Na^(2+) if Zinc is below Sodium in the reactivity series?

In qualitative analysis zinc's reaction with Sodium hydroxide produces Zn(OH)2 which is soluble in excess of NaOH. I mean how is this possible: Zn displacing more reactive metal Na.