What is Base?

Any class of compounds that form hydroxyl ions (OH) when dissolved in water is called Base. 

Its aqueous solutions react with acids to form salts.  Acid + Base --> Salt + Water

Bases turn red litmus paper blue and have a pH greater than 7.

Some of the common bases are NH₄OH, NaOH, KOH.

Bases are bitter in taste.

Bases are Odorless (except ammonia).

Bases are slippery.

Bases react with fats and oils.

Bases give pink colour with phenolphthalein.