Question

how can we say that the substance is acid or base ​

Answer 1

Explanation:

by dissolving in water we know this substance are acid either or base OK friend

Answer 2

Acid is a kind of chemical compound that when dissolved in water gives a solution with H+ ion activity more than purified water.

A base is an aqueous substance that donates electrons, accept protons or release hydroxide (OH-) ions. An acid is a proton donor. While a base is a proton acceptor.