Question

The compound M-O-H can act both as acid or base depending upon the ionisation

enthalpy of the element M. Justify by taking elements (M) of the third period of the
periodic table.
action​

Answer 1

Step-by-step explanation:

A compound that can act both as an acid and a base is called an amphoteric substance. A good example (based on the question) of an amphoteric substance is the Aluminium hydroxide [Al(OH)₃] where Aluminium is the "M" in M-O-H. Aluminium is in the third period of the periodic table. The reaction below shows aluminium can act both as an acid and as a base in different neutralization reactions.

As an acid

Al(OH)₃ + 3NaOH ⇒ Na₃AlO₃ + 3H₂O

As a base

3HCl + Al(OH)₃ ⇒ AlCl₃ + 3H₂O

NOTE: A neutralization reaction is a reaction between an acid and a base to give you salt and water