Question

How base is classified?

Answer 1

base can be classified by following way.

1) By pH - base has pH -more than 7

2) by litmus paper test-  turn blue

3) by test-  bitter

Answer 2

Hey there....!!

Firstly, what is a base?
=> A base is a chemical compound which furnishes OH- ions in its aqueous solution. It changes a red litmus paper blue. It has a bitter taste and is soapy to touch.

Bases can be classified as follows (:

Depending Upon The Number Of OH- Ions produced in Aqueous Solution =>

(1) Monoacidic Base -: Bases that furnish only one OH- ion in its aqueous solution.
e.g., KOH

(2) Diacidic Base -: Bases that furnish only two OH- ions in its aqueous solution.
e.g., Ca(OH)2

(3) Triacidic Base -: Bases that furnish only three OH- ions in its aqueous solution.
e.g., Al(OH)3

(4) Polyacidic Base -: Bases that furnish more than three OH- ions in its aqueous solution.
e.g., Pb(OH)4


What is an Alkali?
=> An ALKALI is a base soluble in water.

Depending Upon Their Strength =>

(1) Strong Alkalis -: Alkalis which completely ionise in their aqueous solution are strong alkalis.
e.g., NaOH

(2) Weak Alkalis -: Alkalis which are partially ionised in their aqueous solution are weak alkalis.
e.g. NH4OH