How could you prove that sodium hydroxide is a base without using litmus papes to test? Give an equation for the reaction

Answer 1

If it isn't too concentrated, rub it between your fingers. Bases have a "slick" feeling. Too concentrated and it may burn your fingers.

Answer 2

2Na+ Cl = 2NaCl

Answer 3

Tell me the answer pls

Answer 4

I also need the answer