Bases( compounds with a pH above 7).
Research has show that the tongue actually doesn't have specific spots for taste. Originally it was thought the back of the tongue was exclusive to bitter tastes.
Acids taste sour, alkaline substances taste bitter.
The Tongue Tastes Bitter after feverRetention of pathogenic heat in the liver and gall bladdercauses Retching, bitter taste in the mouth with thirst, irritability, insomnia, hypochondriac pain, yellowish tongue coating, wiry and rapid pulse.Disharmony of qi circulation in the liver and gall bladder channels is due to interior heat retention in the liver and gall bladder. This causes hypochondriac pain, bitter taste in the mouth
taste bud.
Soap is bitter because it has a chemical called lust in it. Don't judge a book by its cover. Just because soap smells nice doesn't mean it tastes nice.
Bitter-melon.
The tongue however does taste things that are: bitter, salty, sour and sweet.
The four basic tastes are bitter tastes, sweet/sugary tastes, salty tastes and sour tastesSweet, Salty, Sour and Bitter.
Bases taste bitter. Acids taste sour.
Slippery tastes bitter
Slippery tastes bitter
Acids taste bitter.
"Bitter tastes are experienced by quinine."
the tip is sweet, on the very back is bitter, sour is on the side, and salty on the edges. EDIT: Actually, that theory has been disproven a few years ago and it is now known that they are spread throughout the tongue
cyonide
Several important bitter chemicals: denatonium benzoate (this the champion), quinine, alkaloids.
An Acid is a substance that tastes sour and Base is a substance that tastes bitter and feels slippery.