Question

so Naoh is base hence we call as acidity of Naoh whyyyyyy????

Answer 1

because acidity of Noah means the number of replaceable hydroxy ion in the base and it is not related to acids... I think this might be a reason check it plz

Answer 2

Acidity means concentration of hydrochloric is increased in our stomach due to access HCI in our stomach we fell acidity which is also called gas . so to neutralise it we should take NaOH to prevent acidity.
hope this helps you:-)