Question

Define base and explain all alkalis are bases but all bases are not alkalis

Answer 1

Hey


So your question is that :-

What is base ?

Well , there are three concepts behind this .

Lemme explain all .


# ARREHINUS CONCEPT #

:- This concept says that , if any hydrogen containing compound releases ( OH - ) ions or hydroxide ions in its aqueous solution , then that substance is said to be Base .

For eg :- NaOH ( Sodium hydroxide )


# BRONSTED - LOWRY CONCEPT #


:- This states that , the substance which receives hydrogen ions ( H+ ) ions in a reaction is known as base .

For eg :- NH3 ( Ammonia )


# LEWIS CONCEPT #

:- This states that , the substance which donates the electron in a reaction is known as base .


For eg :- BF3 ( Bromine fluoride )



Now ,


→ → Alkali :- The types of base which are soluble in water is known as alkali .


Eg :-

NaOH ( Sodim hydroxide )

KOH ( potassium hydroxide )



All alkali comes in the category of base .

But since all base are not soluble in water , so all bases are not alkali .



thanks :)