how can you tell that vinegar is sour
Vinegar has a sour taste. (Think pickles)
Vinegar is sour due to the presence of acetic acid, which is formed when bacteria ferment the sugars in alcohol to produce vinegar. Acetic acid gives vinegar its tangy flavor and low pH levels, resulting in its characteristic sour taste.
Acetic acid is responsible for the sour taste of vinegar.
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Either you're talking about *sour* or sore.. Sour is something opposite of sweet. Vinegar is sour. A sore is a wound, an injury.